If you signup to social media it will pester you for your email contacts, location and hobbies/interests.

Building a signup wizard to use that information to select a instance would seemto be the best approach.

The contacts would let you know what instance most of your friends are located (e.g. look up email addresses).

Topic specific instance, can provide a hobby/interests selection section.

Lastly the location would let you choose a country specific general instance.

It would help push decentralisation but instead of providing choice your asking questions the user is used to being asked.

Natural scrolling is the first thing I disable when forced to use a Mac, windows, gnome, kde, xfce, etc… all scroll in one direction.

Macos has a unique keyboard and a lot of unique non obvious and non discoverable behaviour. For example I use a lot of windows laptops, left and right click involve pushing the trackpad downon the left or right. Someone had to show me right click on a Macbook was a two finger touch. These deliberate non standard behaviours make switching devices really annoying.

I would argue KDE defaults should follow the most common behaviour across multiple platforms, with the option to implement specific quirks.

The move to default double click brings the KDE default into alignment with other platforms (single click isn’t the default anywhere else).

I would suggest a bigsur global theme that implements macos keyboard shortcuts, mouse actions, etc… would be a better compromise.