@cm Ha I hear you completely. I found that I was spending hours on writing and researching my newsletter, then I would end up spending a few more hours formatting the thing in Mailerlite so that it could look a certain way. It was enough friction to make me forsake the final look of the newsletter in favour for simplicity.
Top tip: You can email a draft to Buttondown. If in iA, you get it over to draft (through the share) then install a markdown email action (depending on your preferred client) and off it goes into Buttondown. Or just copy paste :).
So for the images I actually host Stet.Build on Blot. So all of my images are hosted there.