I have a Note9 I just did a battery & screen replacement on, a Key2 that had not been used until a year ago (so still has great battery life), and a newish Librem5. Most other phones, e.g. those mid-range Samsung’s, or phones without headphone jacks feel like sidegrades rather than upgrades.
They’re all 4G though; both Android model variants are unrootable, and of course behind on their security updates. Next phone would need to be 5G, and ideally allow longer security updates, or allow Mobian + Waydroid install. Maybe one of the Asus ones. Honestly wish Fairphone had kept it or brings it back; they’re missing out on a big segment of customers that would be a good match.
To afford an out of carrier phone, just dipped down to a cheaper plan that still meets my needs.
Default Gnome apps work well, but you’ll need to revert to an earlier version of Gnome Todo/Tasks before it became endeavour, as they had subtasks, but unfortunately removed it with the newer version.