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I swapped out the momentary switch for a standard on/off switch from Amazon for my Eureka Mignon Filtro grinder.
The tiny act of not having to stand there pressing the button in the whole time you are grinding coffee seems petty and ridiculous but genuinely results in a better routine overall. I am now free to focus on other aspects of coffee prep and as a result the routine, even if just for the short time the beans are grinding, is improved
I like multitasking. What can I say.
The main thing is definitely safety. Imagine long hair getting caught in it and trying to fiddle with an on/off switch instead of being able to just let go of the button. Or if a child sucks their hand in it.
It could make for a disastrous situation. But if OP doesn't have long hair or children, then they're probably fine.
Doesn't the grinder have a lid on the bean hopper? That would limit unintentional grinding of non-beans.
Safety, like ogres and onions, is all about layers.