just as "most users" don't want ai baked into their browser, "most users" probably don't use any addons, or use only one--an adblocker. ad blocking (with configurable filter lists) is built into vivaldi already, no separate addon needed. works well-enough.

that said, the chromium base and its dependency on google to provide the 'addon store' is vivaldi's main detractor, because google has been putting the screws to anything that threatens their business as a data harvesting advertising company.

vivaldi does have some features not found in other browsers or other chromium browsers (excepting some in common with opera). the one i appreciate the most is the configurable toolbars, both items and their positions.. similar to how you can configure firefox's main toolbar.

i do occasionally need a chromium browser for specific tasks. vivaldi is the one i use. usually as a 'portable' installation that is easiest to trash when i'm done. it's also the one i use for a couple streaming sites because it does use chrome addons (but also is not chrome, either).