I don't want to be disagreeable but I would like to introduce other information that may be germane.

Blue builds and Yellow builds in the upper tier are still thriving when they have adequate cooling equipped. Yellow builds outrace damage and Blue builds delay the range requirement well enough to outrace damage.

New mythicals do not help midlevel players that don't have a donut box of mythical cooling modules face off against equal level "heat monster" builds. Cooling modules combined with effective weapon choices are proven as able to defeat "heat monster" and that's why heat monster isn't the only build out there and why it certainly isn't an unbeatable build.

There are, in fact, a couple of very good low heat pushbacks that can push out of that danger range, but if one has levelled out of them, they no longer appear in boxes. If they want to build level 30 legendaries or mythicals based on Push, Bully, Blow Back, and Back Blow, I'm for that, but building custom parts for a particular player's mech style seems a little narrow in vision.

New mythicals will always be coming out and most are already on a calendar. We'll see if devs have already planned for the metagame you claim and will introduce the dream weapons you seek.