Some people say background blur can be affected by e-shutter, but I use e-shutter almost 100% and never noticed anything unusual about that over tens of thousands of pictures.
Bokeh can affected when using electronic front curtain shutter with fast shutter speeds - 1/1000s and faster. Here is an article about that:
https://petapixel.com/2018/12/07/ps...in-shutter-may-be-quietly-hurting-your-bokeh/.
But this is not an issue with fully electronic shutter.
On the OM-1, the menu says that when selecting/ activating anti shock shutter (On), shutter speeds under 1/320 will be taken with the "electronic" shutter... this is clearly the "anti-shock" shutter or Electronic First Curtain Shutter, not the silent shutter, at speeds slower than 1/ 320 sec. In other words, if anti shock is activated, then speeds slower than 1/ 320 use EFCS, and speeds 1/320 and faster use full mechanical shutter. You can hear this change clearly. So the OM-1 will not allow the risk of "clipped" bokeh because it will be in full mechanical shutter 1/320 and faster, regardless of EFCS being selected.
Silent shutter is another thing altogether. No mechanical shutter blades in action at all. I think it's over ISO 6400 that noise can increase if using silent shutter.
