I haven't tested this out yet, but in theory this should be fine. Other plugins and child themes can still load jQuery if they need it- the starter child theme does...

I'll run some tests, but open to discussion from anyone who sees any issues here, as this technically would be a change for sites that are live with BS5 and the parent theme active.

I am in favor of this change. However, this is a breaking change and I suggest to wait for other breaking changes in order to minimize the number of breaking changes.

The hero slider uses jQuery. I made a PR removing jQuery. See #1840

The more I think about this, the more I think it's a good thing:

• Understrap still defaults to BS4, so most users won't be affected.
• The child starter theme has separately enqueued jQuery anyway, so users of the child starter theme should be fine (though I plan to remove it there once this version is released since the child starter now only supports BS5)
• It doesn't 'remove' jQuery as much as it doesn't 'ask for it', meaning any plugin that needs it will have enabled it. If a user was adding custom JS somehow, then they should have the ability to enqueue it

Still leaving this open for comment.