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>If you are a professional then just buy more RAM.

That cockiness sounds familiar, and it was the reason why people moved from Java based IDE's to vscode/atom/sublime.

It could be very extensible without being written in web technologies. For example, an IDE I worked on was written in C++ with Qt and had an embedded Python interpreter to allow extensions to be written easily. It also provided a .dll/.so extension mechanism for stuff that wanted more performance than Python could give.

It used 10-20 megs of RAM and loaded in about 2 seconds on the computers of the era (about 10-15 years ago).

It wasn't very good, but that's beside the point :-) It wasn't bad because of the technology stack it was built from.

No, as a professional you just pick better software.

Sufficient extensibility does not require software to be terrible.