Having a custom domain for email also makes it a lot easier to move email provider in the future if you want/need to since your addresses can stay the same as long as the new provider supports catch-all for all the aliases.

we can decide ourselfs if we want mac, windows or ubuntu (no other distro allowed). Our code runs in docker containers and except for the IDE our tools are web-based for the most part anyway, so it doesn’t really matter which OS you use. though I heard there were quite a few issues with docker and Mac when the first M-chip Macs were used. it’s a software company in Germany with ~150 people.