I wish humanity would get over this hyper fixation on short form everything, but I fear that ship has sailed.

It has, the post length limit is an artificial limit imposed by specific instance's configuration and can just be lifted.

It should be rather simple to add an (optional?) article-view which roll's up a chain of comments from the same author, and presents it as a flat collected text. Each comment would a single paragraph, showing if there are comments from others, to this specific paragraph, which could be shown as an overlay, inline or on the side. No functionality would be lost, but it would improve readability significant. I don't understand why twitter and similar services, never made an attempt to improve their chaotic system. I mean on Twitter there are even bots doing this on external websites.

What's wrong with making a Substack?