Knowing how comments get changed is immensely interesting data. And if you design a system from the ground up, adding the functionality to save edits in the backend does not take much effort at all.
Sure, and I can see keeping the last edit (which it obviously does), but every edit? That seems ridiculous if only for the hosting costs.
Really? What do you expect is the edit rate on sites like Lemmy and reddit? One in ten comments? I think more like one in 30 or something. That would increase the storage costs by 3% and a small amount of processing power.
Hosting costs are dwarfed by media storage anyway.
If you’re building a system to allow change-log levels of editing, you have to allow for a significant portion of your user base using it, whether or not they do.
That will add fail points and hosting that’s wholly unnecessary to code and maintain, regardless of what percentage you think will use those features.
Have you ever been in charge of distributed large-scale systems like that with millions of users? I have. That would be bonkers.