Since the AirPods are an offline device, if you buy a pair now they should work indefinitely. But perhaps it would be better to reward manufacturers that don't make you jump through such hoops to use the hardware that you bought.
Until you or someone else pairs them with an iPhone and leave them sitting overnight. The iPhone will send them the latest firmware.
Personally, I will use whatever gear is good as long as there's no risk of it becoming a paperweight because the manufacturer aggressively gets in the way of using it with other operating systems. I'm not "all in" on Apple and never will be. I love certain apple hardware but I'll likely never buy an M series Macbook because one day they'll stop supporting it even though it still works perfectly, and it doesn't support Linux.