[aseipp]

I think it's just the nature of the beast, in this case. Serious "industrial" implementations of a programming language might stick around for a long time, and breaking things a lot can mar the appeal; getting it right the first time pays off in that case.

I think the acceptance threshold can be much lower in other kinds of tooling. "It is what it is", so to speak.

[Quekid5]

Add a sane deprecation process and this is much less of an issue -- see e.g. the Java language. Sure, it's not ideal to have multiple implementations of the 'same' data structure (if a better way is found, say)... but at least you aren't stalling everything and causing API interop issues for years and years.