I am receptive to other thoughts...the problem is that manufacturers up until this point have been coming out with low-thrust BP SU motors that nobody seems to have been asking for. I think they are copping-out by just making easy-to-make motors.
Low-thrust long burn motors have a VERY narrow window of models that can use them at all, let alone optimally. High thrust motors (within reason, don't need a D159-x) can be used for virtually all models, even though the lightest models will not fly the highest on them. Contest flying represents probably less than .1 % of all flights flown, which makes very little sense to target motors to unless those fliers want to pay like $15 each for a B2-x whatever.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !