S10+ here, had it 4 and a half years
Like OP have accubattery on it, for about the last year I'd say now, and has given the battery about 73% - which feels about right, ai can feel the battery isn't what it used to be, but it's not completely gone just yet - I had that with my old phone, battery was just done
Overall I have to say I am very content with the power of the S10+ - for my needs and usage I have no complaints, I got there 1tb model with 12gb ram, and while the 1tb is complete overkill I think the 12gb ram has really helped it not slow down to a crawl,
out of all the new features on the newer phones - a better camera would be a nice upgrade, but I don't take excessive photos and my current camera does the job just fine, but a high refresh rate screen is really what I would like to take advantage off, having eventually gotten a higher refresh rate screen for my desktop, it is something I do feel I would appreciate on a phone, I'm happy with the speed and power I currently have, so a large battery and high refresh screen will be what I aim for, anything else will be considered a bonus lol