The HomePod's actually pretty portable. I was surprised how small it was when I got mine. You could even argue it's designed to be moved around: Handy size, a single unit, wireless, easy to pack (no accessories, cables, power cords/bricks/wallwarts), padded exterior, gently rounded edges, ability to automatically configure itself to any room's acoustics whenever it's re-located.Nobody in this thread is suggesting that it is unreasonable to travel with good speakers. They are merely pointing out how ludicrous it is to travel with the HomePod and expect it to work on a public hotel captive portal wifi. As if putting "Home" in the name wasn't clear enough.
By the way, I travel a lot for my job. I've seen some people traveling with some odd things. What always surprises me is that there is always someone that makes a portable version of whatever anyone needs. Need dual monitors to work remotely on your laptop? There are portable monitors. Need an inversion therapy table for your back? Don't bring the big one you have at home, they make one that folds up into a small carry-on bag. (yes, I've seen someone set it up in an airport lounge) Likewise, there are very good speakers designed for use away from home.
Also, I agree that the HomePod sounds really good at low volume. But so do other speakers. The HomePod is hardly the best in this regard. There are plenty of options, especially if looking in the $350 range, that are designed for on-the-go or portable use that sound just as good. Just because it doesn't have an Apple logo doesn't mean it's bad.
Bring a HomePod to a hotel room is like bringing a floor jack to a rental car. Sure, it's a tool that will work; but it's plainly the wrong tool for the situation. Floor jacks are for your home garage, not for traveling with. The HomePod is the same.
I'll admit it's unlikely I'd take it with me on weekly trips - simply because the wife and kids back home need it. But what if I was single? Why spend $350 on a speaker that sits unused at home?
And then there's vacation rental homes and apartments. Why wouldn't anyone not want to take it along?