Just an aside: MPSA was not MPS, and it's unfair to hold Muse to that. But MPSA was totally and absurdly OP. Like comically so. In my 1.5 of my series, I was using MPSA to power my entire base. I went to the nether and dove into the lava. I had another similar set of MPS in an ender pouch I'd quickly swap into a draining system. I'd generate about a billion MJ into batteries, then go home. The process took less than 10m and would last me days.
It should never be the case that personal mobility and invulnerability is power positive. It's too gamebreaking. It was one of the few times where I felt demoralized by how powerful a mod was and felt compelled to use it. It's why I refused to hook my mining base up to my core power network; I wanted a reason to have to think about power.