I’ve never liked Twitter threads.
If one wants to write a longer piece, there are better ways than to make readers either navigate around interstitial comments or use a 3rd party service — old school web posts immediately leap to mind.
Also, reading longer pieces on Twitter was never good. They were in a narrow space meant for 140 characters. The expansion to 280 characters felt wedged in when read in Twitter’s tools.
If EMu is genuine in taking Twitter to 4000 characters, then welcome to a web product you likely abandoned. I will not join you.