Any reasonable company that approves someone to switch from an office location to remote will absolutely cover T&E for team meetings and other visits to company locations.
If a company hires you at SF HQ and you live in SF, then a year later you announce you're moving to Seattle, it is entirely unfair to ask an employer to float your travel expenses back to HQ.
Your choice to leave, your financial burden. Sure, you can negotiate this as if it were a raise, but be advised that most companies will then simply deny your request to move.