If people were opposed to this trend, Switch wouldn't have sold anywhere near 100 million units. With a Hori Splitpad Pro attached, it's almost the exact same size as Steam Deck.
Disclaimer: Since my previous post was in jest, this one will be too.
How many of the Switch consoles can you reliably claim are being used as day to day portable handheld consoles, and how many spend 90% of the game time docked? And how many Hori Splitpads were sold, because that's a better indicator
Also this is the size of the Steam Deck compared to the version of Switch actually designed to be portable (

):
OH LAWD HE COMIN
Also, people are willing to put up with some inconvenience and compromise if there are no (valid) alternatives. People used to lug this around too:
Handy!
And if people really want bigger and bigger handhelds, why did so many people buy this:
Look, I get it. The engineers didn't want to compromise on the specs, cooling, screen size, and gamepad quality/comfort. You need a decent sized gamepad, analog sticks instead of sliders, you need a decent sized screen, you need (relatively) powerful hardware, and that all adds up to a pretty large device.
Is the Deck portable? Yes. Can you carry it around, use it on the go? Yes. Is it practical? No. Can you just stick it in a pocket or just toss it in a bag without thinking? I wouldn't.
Look at modern smartphones. Once screens became cheap and plentiful, phones started growing and growing and growing, until "phablets" happened, and everyone decided to tone it down a little. Turns out 6 inches is more than enough

New folding screen phones show people are interested in larger screens
in theory, as long as they can be folded up small enough. Turns out there's a limit to what can comfortably and practically be carried around (and that limit is 6 inches).
With this new surge of handheld Windows devices, we can expect to see some experimentation with layout, form factor, and above all size, and I'm interested to see what we settle on after several iterations.