Shouldn’t this solution ncome with some performance hit?

Also, is it a good idea to host so many services, both publically-accessible websites as well as services only available on my home network, from the same machine? What are the security considerations when self-hosting?

Generally speaking - no, it is not a good idea. It is definitely doable, but not very wise from security perspective.

Vulnerabilities in the public facing services are also threats to your private services, because the attacker that leverages exploit in public service potentially gains access to your home network and machine.

A lot can be done using proper separation of applications (separate internal networks, virtual machines, containers etc) but a single mistake can cost you a lot.

The idea is to minimize required motions of hands and fingers, not desk real estate. Even the ordinary keyboards have layers (Alt, Ctrl, …) and these minimalistic ones just use the idea of layers to put the most used and important keys on the home row where they are most easily accessed. And not on a key that you need to stretch your finger or even move your hand.

I don’t care about the aesthetics - my main keyboard is pretty ugly Fifi keyboard. But the ease of typing is fantastic. Occasional switch to ISO keyboard just reminds me that I am not a creature with a hundred tentacles sprouting from my chest ;) The amount of jumping and stretching is just terrible.

But yes, few months of muscle memory relearning can be painful.