Sadly it's just too big for me. The 4a is about as large as I'd go. And I'm even skeptical of that because as networks phase out 3G and even some 4G bands in favor of 5G, phones that don't support 5G will become increasingly hard to use. Talk about planned obsolescence!
You're ok w/ a pixel5 size (6" screen) but you're not ok w/ s10 size (6.1" and has headphone jack)? And the actual phone size of the S10 is smaller than the nexus 5 you mentioned.
The Pixel 5 is larger than the nexus 5, but it's almost in the range of reasonableness. The S10 is well past that size range -- there's no way I can reach the top of the screen.
Admittedly, it is nice that the S10 includes a headphone jack. But phone size is even more important than that to me. Guess I'll keep using my 2016 iPhone SE for a couple more years!
I'd go for a Pixel 5, but... no 3.5mm jack is a dealbreaker.
So I guess the Pixel 4a is my only real choice.