Why have a library-override for jquery?

[miiimooo]

Is your feature request related to a problem? Please describe.

There is a library-override that replaces Drupal core's jquery with an included jquery. The included jquery is 3.5.1 (not sure)

Drupal 9.3.9 for instance included jquery 3.6.0. Loads of things can break there (e.g. jquery.once)

Describe the solution you'd like

Remove the override or is there a reason to have it?

Describe alternatives you've considered
Seems cumbersome to keep this in sync