I'm over 70 years of age. If I'd bought into the latest and greatest battery tech 30 years ago then I would have probably bought and thrown away 3-4 sets of tools because the tech on the batteries changed. It's the same with cell phones or devises. How many have discarded perfectly good devises because of changes in tech? My old tools have served me well and continue to do so.
If your tools work fine for you, then that's all that matters.
That said, you didn't have to be a genius 30 years ago to know the battery tools of the time were mainly convenience at the significant expense of function/capability vs. their corded/air brothers. In that timeframe, I didn't pick up much of anything battery, even though I utterly hated corded tools because of the reach limitations and awkwardness of cords. I made the wholesale jump to cordless with Craftsman's C3 batteries a decade or so ago, and they were absolutely awesome for their time. Since then Sears imploded and C3 was orphaned, so I switched to Milwaukee. The wealth of excellent choices at the time was amazing, and has only gotten better.
Batteries have improved, the cordless tools have vastly improved. Corded has largely remained the same for... decades. Part of that is where the investment went, but part of it was the corded stuff mainly tended to be very mature where cordless needed improvement to get to the level of corded.
Today, outside of battery capacity there aren't many examples where the best cordless tools are meaningfully less-capable than corded. Things like grinders are always going to be energy intensive and therefor better for extended use with a cord, but even that is a somewhat diminishing advantage given how well quick chargers work these days. Three batteries and a quick charger give you a lot of (essentially) continuous work. And many cordless tools have features you don't see in their corded brothers - for example, the "mode" on my Milwaukee impacts that will sense when a fastener is loose and switches from impacting to spinning (or when tightening, spins until snug and then stops to allow you to impact only as much as you want). Quick-stop on my grinder is another example. These and similar features make the usability and safety of those tools eons better, at least for me.
As for battery platforms, I've got enough going on in my garage without a ton of chargers and a bunch of different batteries to keep up with. I've got three total battery platform with two chargers: Ego for the yard/lawn stuff and Milwaukee M18/M12 platforms that use the same charger. This works
great for me.
There are a few tools where I don't think transitioning to battery is worth it for most people (and certainly not for me). I get the lure of a battery miter saw for a contractor or other mobile scenario, but for most of us we're in a single spot that has convenient-enough power. I guess I'd take one if it was given to me, but would have to think about it if it wasn't Milwaukee. That's not a 'team red' thing - I just have a great corded miter saw and given the very-limited value for me of for losing the cord, I'd probably just keep what I've got vs. adding another charger/battery platform to my garage.
I have a completely different opinion for circular saws. I had a fantastic Makita hypoid circular saw. I sold it when I got a deal on the M18 equivalent, and I don't miss the Makita one bit. Cords in that application were hugely inconvenient and occasionally dangerous. If I used a router enough to justify it, I'd make the jump there too for the same reasons. Fantastic tool, except the cord makes it worse.
Anyway, that's enough pre-caffeine ranting for one morning...
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