Like most people, my main computer is a phone.
That’s a big realisation. The device that’s always at hand, and is the first port of call for communication and entertainment and convenience, is your main computer. With the apps available now, there’s no meaningful distinction in utility between a phone and any other kind of device. Some tasks are easier and some are harder due to the form factor, but most tasks are possible — and having it permanently within reach is the mother of all advantages.
The best computer is the one you have with you.