Asus is pretty good support wise I have a garage full of notgear linkstink and other routers that had faults never fixed and support dropped 8 months after release . My Asus routers have been supported for over 10 years in most cases , that is the reason I switched to Asus long term support and they don't penalize you for using Merlin FW warranty is still good using Merlin , you are free to find a better solution for your needs , good luck finding something better in the consumer grade hardware
Second that, the suprisingly the AC-5300 is still supported, and I had two of them in AIMesh on Merlin (for years and on an early 384 release when I eventually retired them and putting in a closet for quite awhile), before gifting them. If my cousin's house had not been struck by lighting last year, they would still be in service on current 386 code which for them was, and is more than enough.
Not at all bad when it comes to consumer devices, a pretty good run/life cycle.
About to go the ASUS/Merlin route again on current AX based gear, to replace some very old Netgear routers that I had to revert to when the AC-5300's blew up, and will be a nice upgrade to my old AC-5300's that Mother nature destroyed, and decades beyond the router setup they are currrently back to using.
Change is a constant, embrace and accept it.
You're a passenger on a roller coaster, that you have very little control over, with the only real choices being, to get on and ride it or not, and if so, where to sit and for how long, and when to get off, before being forced off.
You just have to figure out where on the change curve you're comfortable being (your sweet spot), but make no mistake you are on the curve, that has a beginning and that will eventually end.