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> I don’t think Java and Rust were so ok with completely removing features.

This just shows that you weren't around for pre-1.0 Rust. Back then Rust was infamous for the language making breaking changes every week. Check out this issue from 2013 tracking support for features which were deprecated but had yet to be removed from the compiler: https://github.com/rust-lang/rust/issues/4707 , and that's just a single snapshot from one moment in Rust's prehistory.

Semantic major/minor version 0.15 means it's still in development. It's not supposed to be stable. Going from 0.14 to 0.15 allows breaking changes.

Try making a similar change between version 5.0 and 6.0, with hundreds of thousands of existing users, programs, packages and frameworks that all have to be updated. (Yes, also the users who have to learn the new thing.)

> Just to make sure they did it right

Let me guess: they didn't, and now there is a third-party "right" way to do it.

(We've been here before, many times.)