In a multi-mod environment, it is generally futile to attempt to force players into an "intended way". They will either do it because it's interesting, or resent the requirement.I agree mod synergy is important but what people do with the RoC cross mod engines is not synergetic its total circumvention of mechanics.
I mean you even admit you use magneostatic engines to circumvent transmitting energy the intended way. IMO 2 thirds of the RoC's gameplay is transmitting that rotational energy effectively. IMO Most of the nuance of RoC is messing with gears and shafts as the actual generation of power is the same as any other mod, engine get's its fuel, engine outputs and the machines they power are in a similar boat most of the machines are merely solutions that other mods also provide (I will admit there are a lot of appliances and toys that do things other mods don't). It's the nuance in managing the output of engines is what sets RoC apart from other mods.
As for the current state of motivation, let's see. I'm using shafts and bevel gears in order to transport my solar power from the three towers to their rotational dynamos which feed one tesseract, I'm using dynamometers to monitor power throughput at various points, I've been using shaft junctions to run a grinder with four steam engines, I'm using CVTs and gearboxes to adjust the torque/speed ratio of my tier 4 magnetostatics in order to run my excavators, miners and the bedrock breaker. I've devised a 4x4x4block of shaft junctions and bevel gears to split the output of a 900MW reactor into levels that can be handled by redstone energy conduits. And all that since v19 where the Magnetostatics hadn't been nerfed. There is motivation enough to use RoC mechanics.
The only thing I don't use RoC mechanics for is actual power transmission within my base and long-range, and things will stay that way unless power conversion is made completely impossible - which would be, needless to say, a major turn-off. My base, and as I suspect, like most other player's bases, is a constant work in progress, and power distribution systems that adapt themselves to varying power requirements without intervention, at least to some degree, are non-negotiable. To say nothing of interdimensional transmission... I'm ditching my tesseract-based system when RoC offers me a way for interdimensional logistics pipes routings. As I said, mod synergy is a good thing.
And there is no one and only true way to do things. I admire RoC for being one of very few "global tech mods" with a distinctive style, designed to do many different things in its own way. Being forced to use all components, though, will only result in resentment.