The diameter of flatbars is also slightly less which makes it even less comfy if you have big hands, but of course to make it more comfortable you can do a double wrap or so. Still not worth the trouble imo
I've only done it with the Brooks tape with cushioning underneath for the looks and then on a beater just to keep the cost down. I did make the overlap much closer so to give more cush.
The diameter of flatbars is also slightly less which makes it even less comfy if you have big hands, but of course to make it more comfortable you can do a double wrap or so. Still not worth the trouble imo