A bipod is a good option and much more stable than a cheap, light, portable plastic table.
The rear bag goes under the butt stock......the same place as if on a table?.......
You can get a Harris for about 100$ (A lot less than a suitable table) and it works great for me out past 1000 yards.......
Why would you consider getting one tall enough to shoot out of a chair? Lol
Shooting from a bipod may very well be a real world hunting position for many people
People use a bench for sighting in and then practice from other positions? Oh really, thanks for that information. Had no idea.....
You probably don't hunt with a table hanging off the end of your rifle either and a bipod is easily removed or carried in your pack if you don't want it on while hunting........
But please, continue with the list of problems.