These are problems to be addressed by the people who design rifles. The inherent lack of certain features or the issues you've pointed out aren't flaws of the bullpup concept but shortcomings of existing designs. For example, with the exception of adjustable LOP, most of the problems you've listed have been addressed with the Desert tech MDR. With the mag release where it would be on an AR you have the same quick mag change (and don't you dare tell me about how it's unnatural to stick a mag in around your armpit. I have run the reload drills both on ARs and to date an RFB, Tavor and T97. the only place where the time differs is during mag removal.) The forward ejection addresses the left hander issue, while the forward ejection chute can be opened and thereby you have clear access to the chamber just like on an AR. the rifle can be fired with the port open in which case it would eject to the side as per a tavor.
If you think you don't look away from the fight using an AR when looking into the chamber thats just a AR elitist BS. If you have the rifle canted to the side, up, and looking into the chamber you ain't seeing nothing beyond your rifle. "Keeping your rifle in the battle space" is an advantage in drills where you don't need to look to complete it, where muscle memory is all you need like reloading. if you're looking into the chamber you've already taken your eyes off the fight. The AR has no advantage here.
HOB issue, again an issue to be taken up with the designers. there's no reason for a bullpup to require such great height over bore. Entirely just an issue with current designs. Again i believe the MDR does not have this issue
As for adjustable LOP, you know i really don't know why there isn't already a design with adjustable stock. that is my one complaint across all designs so far. I mean looking at the MDR, Tavor, even the keltecs, there's more than enough room back there for an adjustable stock mechanism. Granted any design that fits into that space won't give you the 6-8(?) inches of adjustment an AR stock would. but one could definitely work in a stock that will allow the user to adjust up to about 4 inches. which is about the amount you'd need anyways. the last few positions of an AR stock are mainly for easy storage.
Someone above(a long time ago) mentioned some ignorant BS about the bullpup designs are evolving whereas the AR is not. The Steyr AUG is the oldest bullpup design and is still a far better one than what is currently available from other companies, so much for evolving. As for the AR evolving, it has, a lot, and often. There isn't/wasn't much that needed improvement to an already amazing design.
The DTA rifle looks interesting (I would say the best of the bullpups thus far)but is still an answer to a question no one has asked. The fixed LOP is still a major failure, as is the difficulty in reloading. I don't need to look at my AR(or VZ) to reload, this keeps my eyes down range. For the brief moment a shooter may need to view the rifle during the reload(to orient the magazine, not to observe the chamber. I don't do it and anyone with half a mind doesn't either, its flashy bullsh*t. You can't see the chamber in the dark and you won't stop and check it when the reload is a critical one, so there's no point in including it in ones manual of arms.) the action required is a movement of the eyes, not the head and eyes. The later eliminates your ability to detect movement via your peripheral vision as your head is down. Reloading a bullpup from prone is far from intuitive or natural. Heavy clothing and load bearing gear also add to the difficulty of a bullpup reload.
Mechanical offset is still an issue as most bullpups have insane offset whereas the old AUG does not, so much for "evolving" design. As for the adjustability of the classic and now standard AR stock, its actually the first 3 positions that are important, not the last three. Most who use an adjustable stock like that of an AR run them too long. This is the result of poor stance which is a direct result of poor and/or absence of training. Learn to shoot, learn to use your equipment properly. Nevertheless, you say an adjustable stock could be worked in, so why hasn't it been? So much for "evolving" design.
Other issues which I likely posted about way back when this thread was fresh include the lack of "rail estate" for the MIL/LE customer base(or the financially free civilian). How is a soldier/officer/citizen supposed to mount an optic, iron sights, light, sling, visible/IR laser, NV, bipod or any combination thereof on a rifle with very little rail space? Steyr even offers an add on piece to give the user some more rail space http://www.steyrarms.com/store/index.php/picatinny-rail-1/steyr-aug-factory-accessory-rail-kit.html.
Having the chamber next to your face is a bad idea as well. If you've ever observed a catastrophic case failure or an over pressure round you'll appreciate the separation of the chamber and the stock on a conventional design.
TDC