There's nothing high maintenance about a tube amp other than replacing (and occasionally testing) tubes.
A self biasing tube amp is the easiest, but even a tube amp that requires biasing is easy.
It certainly doesn't require the end-user to take the amp to a technician for any reason. However, if the idea of changing or testing tubes seems like something you'd rather have a technician do for you, then perhaps a tube amp is not appropriate.
We all have our comfort levels.
A self biasing tube amp is the easiest, but even a tube amp that requires biasing is easy.
It certainly doesn't require the end-user to take the amp to a technician for any reason. However, if the idea of changing or testing tubes seems like something you'd rather have a technician do for you, then perhaps a tube amp is not appropriate.
We all have our comfort levels.