These days many of us not keeping same phone much more than a year or two- too many significant improvements each year to ignore.
Plus, for someone who needs a phone or tablet for much of their work and is on the road a lot, I'll take fast charging instead- even if you tote a laptop, you need the phone as a hotspot.
Because once battery is low forget about simultaneous charging while tethering \ multitasking \ traveling- a 5 minute break more tolerable than 1 hour.
But these days it's a crapshoot to find an empty seat & electrical outlet somewhere- due to COVID & police defunding + excessive shoplifting & homelessness, most places limit capacity \ cordon off \ remove seating \ cover up outlets.
As well every year of this past ½ decade has brought can't do without improvements- it's not the time to use same phone for even two years or use anything but the top of the line processor- which now lets phone run much cooler & supports UFS 4 \ LPPDR 5 \ 5G Quadruple Carrier Aggregation. Factor in the rest improved again each year- WiFi \ BT, faster & adaptive refresh, larger, better screen & resolution, faster USB \ charging... and there's one brand making this affordable universally.
Esp. now that OnePlus is on scene- it's not just a choice between $$$amsung or pay less for smaller size & lesser features. And trading in yearly is fairly affordable thru them.
Looking forward, the next processor features & multiple eSim \ iSim + if they get Fold tech right, will obligate another upgrade.