I'd recommend going with Sony nowadays. The Xperia 10 series especially is a lot like a 4a.

Sony are giving up on the compact flagship 5 series because "People are no longer interested in compact phones and would rather go for a large one if it offers the same benefits". And unfortunately the specs of the Xperia 10 just doesn't cut it for me. :(

Ugh, pockets aren't getting bigger.

Buying my last phone was a real challenge - even 6.5 inches long feels huge, and there were very few options under 7 inches.

Funny enough I found some old pants that still fit, ~20y old, and those pockets does not fit a modern phone. But I remember my Nokia 6210 being just the right size for them.

Sounds about right. I remember around 15 years ago a family member got a new phone and I thought it was laughably big. Probably smaller than what I'm currently using in retrospect.