Don't worry about that. It just means you won't have to upgrade the sub down the road
Yes, I understand where you are coming from though.
I ran a Rythmik amp with my Adire Tempest (15" in a sonotube tuned to 17.5Hz) for 5 years without issue and it never felt too hot to touch. I pushed that thing hard too.
It is widely known that the Legend subs have had amp issues here and there. Maybe some bad batches or maybe the amp isn't quite up to spec. I had my Empire amp die also, but Chad replaced it. I don't want to say anything bad about them, because though it took longer than I would have liked, they did take care of the situation to my satisfaction. I helped Jeff with his Legend issue also (long story).
Two are better, but also requires additional setup (placement) and calibration to get the best results from the two of them working together.