Sorry. Long rant.
The TL;DR version is, don't buy on the bleeding edge in wireless (generally any technology) unless you don't mind getting cut sometimes. Also, especially with Wifi gear, it is a disposable consumer electronics product. It is not something you should ever expect to last a life time, or even a decade.
The longer, rant continued version; yes, some people still use ancient 11g Linksys routers with DD-WRT on them and thing they are the awesomest thing. This people are either ludites, have very, very limited wireless needs/slow internet connections or else have their head buried in the sand. Even if they are still working fine, the current state of the art wireless just in a not a-typical configuration of a new high end router to laptop with a higher end wireless card in it is EASILY 15-20x faster. Even a lower end configuration with a fairly new router and a newer phone (I am assuming 11ac 433Mbps adapter in the phone) you are still talking easily 4-8x faster. Yes, it means your facebook can load really fast on your phone with newer stuff
Stuff is not manufacturered to last anymore. This applies to most things. I do feel like some industries have actually gotten better recently. Cars being one. I feel like from the mid 1970's to mid/late 1990's quality/durability had dropped off a lot, but has picked up since then (in general, exceptions of course are prevelant). Appliances and especially electronic appliances need not apply though. They are generally not meant to last for a huge variety of reasons.
Moore's law still applies, as does planned obselence and even just simply really bright people figuring out how better to use the air waves, push electrons, etc. Also changing regulatory environments. All this means that even if something CAN last, it will be "out dated" no matter what you do, and buying the bleeding edge does not necessarily mean you get something that is going to "last" significantly longer, either due to the product physically dying, or technology advancing so quickly.
In a lot of ways like a car, you are better off buying last year's model, saving a bunch and keeping it for 3 years instead of 4, and then buying last year's model when you go to buy another one (I speak to wifi routers, not cars. I'd hope you are only buying a car every 7-12 years, though if your thing is a new one every 3, I guess more power to you).
Just looking at Wifi routers, within general reason, if you buy something that is "a year old", give or take a bit, you might be looking at $50-80. Something in that range possibly/probably (exceptions of course). If you then kept it for 2 years, and then bought another "last years model" and kept that up (IE slightly outdated every 2 years) for a decade, you'd be looking at around $250-400 spent over the course of a decade to have slightly outdated wireless gear, but probably not anything obselescent.
If you bought bleeding edge, but kept it for 3 1/3 years instead (make example easier), you'd probably be looking at spending $150-300 each time you upgraded. That ends up being $450-900 over 10 years, to temporarily have the "best of the best" and keep maybe on average slightly better technological edge over the time period involved with updating every 2 years, but with slightly more mature Wifi gear. If you upgraded every 2 years to stay resonably well ahead of the "one year back" route instead of a bleeding edge, but longer upgrade route, you'd be looking at spending $750-$1500 over the same 10 year period of time.
That is all assuming you can get by with only a single router. I personally can't as I need one router and two APs (for now, with addition I am planning I'll probably need a third AP), so bleeding edge every 2 years would mean probably >>>$3000, even every 3 years would be super expensive. I go the route (generally) of just replacing my router every 2 years or so with something just a little back from bleeding edge (example, I have an AC1750 router that I got recently, that is a newer model, but AC1900 and now AC2400/MU:MIMO/XStream is the bleeding). The old router generally becomes my access point inside and my AP inside becomes my garage/outdoor AP. Cycle of wireless life for my stuff. It still ain't super cheap, but it keeps everything vaguely update, at least enough for my needs, and in the grand scheme, ~$100 every 2 years isn't that terrible (considering I have 3 wifi routers/APs that have to get replaced with some periodicity).