Yup, which is why im going back to AD&D while porting some of the best stuff 5e has. like skills, magical items, concentration, bound accuracy and class features. Feats too, in the form of weapon and non weapon proficiencies depending on wether they are combat or non combat feats.
Old dual classing but for all races too.
Why would you do this, or even think about it? 5e is actually considered to be an evolution from AD&D2e, i.e. what a possible AD&D3e might have looked like rather than D&D3e. It contains some of the better elements from all editions, especially 1e, 2e & 3e with smatterings from 4e.
It's also far easier to port forward than back; just look at your own list of things you would have to port. Why would you want to go back to Thaco, needlessly complex subsystems (thief skills anyone?) and so on. Not to mention 5e has the best iteration of D&D magic ever, by a long shot.
If you miss 2e just use the old 2e sourcebooks and campaign settings and convert whatever you need to convert like NPC & monster stats, assuming they don't have equivalents in 5e already.
The only thing I prefer in 2e than 5e is the lower amount of hitpoints overall, making fights faster.