The only reason I like the MILS is that the baseplates connect together easily and the seams are less noticeable. I would be all for letting go of MILS if I hadn’t already spent so much on white plates to MILS all my Christmas stuff :p At least allow me this year to use them; provided LUGBULK comes in at a decent time.
So I’m a big fan of the cohesive Lego display look and personally, I don’t like seeing a big display with the table cloth showing. It just looks like they ran out of time and/or parts. For that reason, I would place baseplates wherever there’s empty space and force ourselves to build something fun in those spaces to liven up the display. This opinion does not include the space displays with tablecloth discussion as I’m not familiar enough with displaying that theme to comment.