EDIT: Apologies. Updated with a link to what gorhill REALLY said:
Manifest v2 uBO will not be automatically replaced by Manifest v3 uBOL[ight]. uBOL is too different from uBO for it to silently replace uBO – you will have to explicitly make a choice as to which extension should replace uBO according to your own prerogatives.
Ultimately whether uBOL is an acceptable alternative to uBO is up to you, it’s not a choice that will be made for you.
Will development of uBO continue? Yes, there are other browsers which are not deprecating Manifest v2, e.g. Firefox.
memories of Internet Explorer doing the same thing intensifies
They did? Never used that garbage. Switched from Netscape Navigator to Opera to Firefox.
I used chrome on mobile since in the old days, Firefox mobile was unusable, but that’s been years ago.
Now for the 3 websites that stubbornly refuse to open in FF I use Edge on desktop, and kiwi on mobile.