For #3, a lot of it IS jarring and often it is supposed to be... although in jazz there are no wrong notes, just bad resolutions (jacob collier). Oftentimes in microtone you will find a passage that sounds horrible at first but makes sense at the end, hopefully.
I think that you can definitely get used to it. It is a little weird to hear non-typical notes, especially if you have done any kind of pitch training, but at the end of the day it isn't the notes themselves that matter but their positions relative to each other in a chord or passage.
The youtuber I linked also has a bunch of Lumatone performances which is an instrument with a hex grid layout where you can change the pitch of a chord by shifting your hands up or down on the grid while maintaining the same hand shape. That approach makes some really good microtone music whereas a lot of straight piano layout players end up getting stuck in "ambient space noise" modes.
I think that you can definitely get used to it. It is a little weird to hear non-typical notes, especially if you have done any kind of pitch training, but at the end of the day it isn't the notes themselves that matter but their positions relative to each other in a chord or passage.
The youtuber I linked also has a bunch of Lumatone performances which is an instrument with a hex grid layout where you can change the pitch of a chord by shifting your hands up or down on the grid while maintaining the same hand shape. That approach makes some really good microtone music whereas a lot of straight piano layout players end up getting stuck in "ambient space noise" modes.