I would absolutely assume that "remote" means "absolutely zero travel" unless that was spelled out.

Remote means you don't need me physically present at a particular place (outside of knowing my location for tax purposes). It's pretty clear in the word "remote". If that's not always 100% the case, I would expect those expectations to me made clear during the hiring process, not after I've already come aboard.

Do you really think it would be unreasonable for someone to balk if you hired them for a remote role but then asked them to fly somewhere quarterly after they were onboarded?

Yes. I would think it unreasonable. I know a ton of remote people including myself and we all travel quite a bit. Now a job with 25% travel should certainly state that in the job description but if zero travel is non-negotiable you need to specify that up front—and don’t be surprised if you run into issues if managers change.

You are not in a role position if you are required to travel. It isn't as common as you think.

Remote means you are not assigned to an office period. It says nothing about whether you never/rarely travel or travel essentially 100% of the time eg many consultants.

Obviously people should take positions that align with their preferences however. Just be sure to specify upfront and be prepared to move if circumstances change.

I’ve been involved in hiring at multiple companies with fully remote positions, and all expected travel to a team building offsite at frequencies around once every 6-12 months. From everyone I have talked to at other companies too that is a standard expectation, and for very good reasons - humans work so much better as a team (communication, empathy, charity, etc) with just that small amount of face time.

I've worked exclusively remotely for the past seven years and a surprising number of companies I've worked for and interviewed for "strongly encouraged" on-site meet ups at difference frequencies (quarterly, bi annually, annually).

I never attended any meet ups. I felt guilty about it but like you're saying here, I signed up to work remotely, not in an office ever.

That's fair, I guess sometimes people have different definitions of "100%".