First of all I respect your love and support for Vivaldi. I'm also happy that you find something that is satisfying for you.
Yes, Vivaldi is a solid option but it never clicked for me because of all the extra bells and whistles you mentioned.
When I said I'm not satisfied with all these other famous browsers it's because I tired them on an off many times but for my use case they don't bring me anything over Firefox. I don't need nor I want a built-in RSS reader, ad/tracker blockers, VPN, email client, translator etc... It doesn't make a browser better in my humble opinion. It's just adding extra stuff that I don't want. I want the freedom to add or remove anything I want.
I might be the odd one but I want things to be simple. When I buy a phone I don't want to be paying for the extra cameras it has or when I buy a PC I don't want the RGB stuff or when I buy a car I don't want it to be connected to internet and require software updates. I don't want my fridge to have internet connection nor my TV to have one.
Ahahaha. Thanks but no thanks. I don't have a fear of missing out and I don't see myself using Vivaldi as my default browser in anytime soon.
Good luck with your conversion efforts.