Good points, Ian. Size was a minor consideration when I got my Z6--quality, the experience, and the fact that it bought new things to the table swayed me and pried my credit card out. When I travel with too much gear I lament my inability to pick the right gear, rather than lamenting what get left at home. I tend to favor zooms over primes, I've gotten over my love affair with fast glass (f/4 is fine) but what I would pick every time if it were available and affordable, would be an internal focusing zoom lens over one that extends many inches, or more! My 16-35 f/4 is the only one I have right now.It may just be my opinion, but designing lenses so large and heavy in today's time when people are traveling and taking their camera with them more is a bit of a head-scratcher personally. I know that when I'm traveling and taking my camera gear with it, there's a "sweet spot" in terms of size and portability. Going beyond that tends to mean the gear stays at home more often, at which point I begin to question why I purchased it.
It's one thing for reviewers to get a lens and say "Wow, look at how sharp this lens is! INCREDIBLE!". It's another thing for them to live with that lens over the course of months or years, and shoot with it regularly.
EDIT: I correct myself, my 70-200, f/4 is an internal focusing lens. Too much coffee? Too little wine? Old age (I just had a decade-ending birthday!)?