That doesn't mean 5E plays or even feels anything like TSR D&D. (Actually, I personally think it feels like the height of 2E, but that's a different thing.)
it will take a little rework of what classes atually ARE in SD, but that's okay.
I have often considered trying to break all the 5E class and subclass abilties into talent trees to make that game classless (but with levels still) and I decided ultimately that the juice probably isn't worth the...
As an aside, my next project is going to be to try and create a "career tree" system for Shadowdark somewhat inspired by the old WHFRP one. Your level 1 is a scrub, levels 2-4 is somewhat better, levels 5-7 a real pro and levels 8-10 the pinnacle of the line. All using prereqs and stuff so there...
In general, I don't mind "classes" (archetypes, whatever) especially if there is some room to customise. I am not a huge fan of the way 5E does it because you have essentially made your last choice by 3rd level, but systems that offer continued choices within classes are okay.
I also like point...
I was specifically responding to the idea that they are going to somehow magically be able to give 5E an old school difficulty feel. Doing so would be to turn it into Shadowdark.
But your disdain is noted.