Wont be long before we get a definitive on the scaled down to 60 thing but i know the rest is on purpose. This was said almost 2 years ago at this point.
So here it is boys Ion basically says nothing is going to be done and that it will “eventually” get better as we gear and get more soul binds. So much for scaling not affecting old content.
" * Old raid tuning had a bug in the first week of Shadowlands for Legion content that made it harder as you leveled.
Old raids might be a little harder at max level now, but part of that is from your stats going down as you level. Things should get better as you get more gear and Soulbinds. Eventually your player power will exceed what it was at the end of the last expansion."
https:// www.mmo-champion. com/content/9650-Developer-Interview-Ion-Hazzikostas
So eventually in the death throes of this expansion you might get to farm old content.
UPDATE: Another middle finger was given on February 22, 2021
https://www.wowhead.com/news/ion-hazzikostas-on-soloing-old-raids-legion-raids-easily-soloable-by-the-end-of-321105