> broke their workflows because of vague technical reasons
> I switched to Vivaldi
You refer to important security improvements as "vague technical reasons" and you switched to Vivaldi, a browser that is based[1] on extended stable Chromium, which is not "recommended for any team where security is a primary concern"[2].
>security fixes that are relevant to any Chrome Browser platforms will be landed on the extended stable branch
>complex and risky changes [...] may not be viable to backport
Big deal.