We can't predict how it will work on a new game, made a decade after their last one.

Except something as small as moving from v15.1 to v15.2 will get mods blocked in Minecraft. And regardless this isn't a good reason to block user's ability to add in mods. Modders are smart enough to realize a mod that hasn't been updated in 5+ game versions probably won't be compatible

Also, said communities like the tools because they save time on a lot of steps such as checking for updates and dependencies, optimizing load orders, profiles for mod lists and save files, etc.