MCH's lack of Shared Actions

I am surprised that some of the buttons on this jobs weren't consolidated with the new shared action system, as it's already the case for example with Wildfire into Detonator (has been since ShB...):

- Rook/Queen into Overdrive? Why don't we have this? The rotation isn't even asking us to use it manually, much like detonator...
- Hypercharge into Heat Blast?

I assume its because Hypercharge can become two actions, Heat Blast and Auto Crossbow. As for Overdrive, yeah that could be consolidated reasonably enough.

I guess this wasn't their priority.
MCH has the least amount of different buttons.
Might be a conjecture but they may have understood that MCH amount of buttons was viewed as underwhelming and going even further would lead to a backlash.

As for Queen overdrive, it also may be to avoid people spamming the button accidently pressing overdrive.
Hypercharge into Blazing shot could make sense but DRK kept delirium separated and it isn't a problem.