I don't know if it's just ethical or their unwillingness to improve but they have left a lot of issues open for several years.

Issues like -

• Auto dark mode for web pages - they removed it when Chrome for Android dropped it, but never picked it back up. All other browsers have it now
• Geolocation on Mac. Their argument is weird for this and the issue is still there for over 5 years
• A lot of changes nobody asked, something like address bar auto complete, which they forcefully changed to top sites without even giving options
• Slowdown because of bloat - while a lot cliam that it isn't the case, Vivaldi has brought my M1 Mac to its knees, even with brand new instace. Again only one to do so