And also, there's not just engineering. HR, Accounting, Lawyers, Trust and Safety, it's all there
Starting from the position of what don't I know about this situation, and / or what systems could cause it to be in this seemingly intractable state leaves you open to all sorts of new learnings vs. assuming there aren't intelligent, capable people on the other side.
The part of Twitter required to maintain a decent stock of product has not needed to change outwardly, because it hasn't had to. There hasn't been a new version of human in a very long time. But even then, anything that creates more product (drives more engagement) means more revenue opportunity for the 90% of the platform you will never touch.
The parts of the product that theoretically make revenue for Twitter have changed significantly over time. Analytics, ad intake/spend, promotion for influencers/brands/etc.