A mild thing, but most people are right handed. Thumbnails to the right in list mode let's you quickly tap images to open. Having them on the left makes it more difficult to tap. Can there be an option for this in settings?
I do prefer thumbnails to the right. The problem is the 3-dots more/side panel becomes inoperable in some posts because the thumbnail overlaps it. See screenshot. Can the thumbnail position/size be adjusted so it doesn't overlap the right side of the post menu?
Edit: Issue fixed by turning off edge to edge display setting