Did someone say MCH????
also very misleading as the first few suggestions sounds like redesigning it more so than 5.0 did as 5.0 did more deleting than reworking in all blatant honesty. You cant just add "reload" with no additional information if they are as simple as a damage buff then its a boring addition to just press something every so often ie a less reassemble than just add "Raging strikes" or "Internal Release" or a Bunshin with less impressive animation.
Heat blast output can literally use anything even a unholy boring GNB replica rotation.
Also the turret changes is 100% irrelevant due to Battery being unchanged, turrets appear for all of 5 seconds then leaves is the current incarnation if that doesnt change i doubt adding more of them regardless of how "cool" they look will make the system any less engaging
Wish i had more to say but you glossed over many of my MCH bugaboos, Wildfire, gauges, charge systems, turret system and more that i dont wana go too much into. MCH doesnt need to worry about retainment they need refinement