@Catweazle, thank you for your kind welcome! Will be happy to be in contact with you!
I don't think that Vivaldi considers "My Blog" as a simly online notepad or wants people to go looking alternatives to Vivaldi blog. On the other hand I understand that the more features (i.e. plugins, themes) you enable the more support and development efforts will be necessary.
Nevertheless Jetpack is quite an essential and very special case. Even the free version provides
visitors statistic by time and by countries,
security features,
tools for media content optimization,
two directional integration with social media,
"related posts" feature
etc.
Is it crucial for commercial sites only? I don't think so. For instance Wordpress.com isn't a dedicatet hosting provider for business sites and their Wordpress implementation has many limitations, but Jetpack makes this platform very and very attractive for people. I wonder if Vivaldi could become a real competitor in this niche.