OK, so, let's be honest here... how many cordless tools that are more than, say, a decade old do you have?
Because my current Milwaukee tools are all right around 5 years old, and I have yet to suffer a single battery failure... I've dropped and broken a couple M18s, but have yet to have one lose its charge or refuse to charge. If they all up and died tomorrow, and I replaced them and got that much again, my stuff is now a decade old. How likely is it that either none of my tools will be needing to be replaced, or just added onto, either way giving me a decent excuse to buy a kit, getting me the batteries I need cheaper than buying them one their own?
Is that "tricking" me? It's just weighing sunk costs IMO, I had something like 6 Makita LXT tools when my next-to-last pack went **** up before the 3-year mark... they didn't manage to "trick" me into buying more tools, I bit the bullet and switched to a platform with better battery life.
And finally... my dad is a contractor, and got heavily into Ridgid many years ago when they started with lifetime batteries, way back when it was a Home Depot thing and you could actually walk into HD and swap out a dead one. I asked him for advice on what to buy when I bought my LXT stuff, so ~2010, and he was already pretty down on how the Ridgid no-longer-warranty-now-it's-a-service-agreement was being handled. He's been moving back to Dewalt the last few years, partially because Dewalt has finally re-started innovating, and a lot because he was tired of dealing with the BS from Ridgid.