Battery and led technology is growing so fast. Your expensive light will be pretty obsolete in 5 years
I can't say I fully agree with that. I think the LED revolution was mostly over 5 years ago already. Now, it's an LED and battery evolution. Slow, but steady.
I have inexpensive lights from 5 years ago that are still on the market and top recommended choices today.
My canister light is a top brand and top quality - and still the current model for the manufacturer. The price on that light is right in the ballpark of what top lights were 5 years ago.
I fully expect all the lights I have (which are all LED lights with Li-Ion batteries) to still be very competitive with whatever is the latest and greatest 5 years from now. Competitive on price, features, and capabilities.