By “legacy wp” do you mean the Classic Editor? If so, that will never receive improvements.
If you’re running into bugs, or feel there is a way to do things better, with the new editor and have confirmed the issue still exists with no active plugins and the Twenty Twenty or higher theme (up to Twenty Twenty-Three) in use, please do report them by following the steps at https://make.wordpress.org/core/handbook/testing/reporting-bugs/
Why wouldn’t you update classic editor? A lot of developers use classic. (Hate Block editor)
I can’t speak for that decision, I wasn’t a part of it, but when the new editor was introduced, it was announced as the next phase of WordPress’s editor, not as an entirely separate thing.
We’ve made some big upgrades to the editor. Our new block-based editor is the first step toward an exciting new future with a streamlined editing experience across your site.
https://wordpress.org/news/2018/12/bebo/
That same announcement also warned:
Prefer to stick with the familiar Classic Editor? No problem! Support for the Classic Editor plugin will remain in WordPress through 2021.
Emphasis mine.
The life of the Classic Editor plugin has been extended a few times:
will be fully supported and maintained until 2024, or as long as is necessary.
https://wordpress.org/plugins/classic-editor/
But, I suspect it inevitably will be discontinued, it hasn’t been part of WordPress’s roadmap since 4.9.
BTW, here’s what’s next for Gutenberg: https://wordpress.org/news/2023/08/the-future-of-wordpress-whats-next-for-gutenberg/
FWIW, I understand that folks still use the Classic Editor, I understand why, but I’m just clearing up here that the Classic Editor will not be updated any further, and hasn’t since WordPress 4.9. In fact, the only fixes going into the Classic Editor plugin are there to bandage compatibility with current WordPress releases.
I tried switching to block editor, and it brought my site down.
