This mod allows shooting w/ bipod and Tapco mag is not an issue-aka it doesn't scratch the soil or table.
With extended mag release changing mags is super fast. If you tape two mags together- your fire is like 10 rounds, I will not do it, but just in case, so ppl know.
This mod allow loading the mag from top as a regular SKS Mag
Again, this mod was not to look cool or smth, it was done as an newbie gunsmith experiment.
I do not deny that original design is quite effective in good hands, besides, it has aesthetic look, historical look etc.
This is not the point here.
Again, the point was an xtensive experiment, trying to "modernize" the gun and see how convenient it is in this specific mod.
As to inconvenience with cleaning: it is a reliable gun, I didn't hurt it inside anyhow, so I'd expect it will continue to be reliable. If I have to strip it in the field-I can still do it with 30-40 seconds longer time and more extensive stripping, I agree. But, in majority of cases, I totally disassemble the gun except the trigger group to clean it anyways. In SHTF scenario, yes, those 30-40 seconds may cost life, I agree, that's why, there must be other things on your body for those cases.
I totally agree, that a metallic mag is much more solid and incomparable to TAPCO plastic, but TAPCO mags have their own positive features

Metallic 30 rounds sks mag + no crazy 5 pins limits would be even better

But, many metallic versions jam even worse than TAPCO mag, more expensive and .... there is smth else