You can run 3 DP monitors, just get a cheap type-C-to-DP adapter. $15 gets you a perfectly decent one, and functionality-wise it'll be indistinguishable from a native DP port. Besides, saying that 3xDP setups are more common than dual HDMI setups? I don't know what world you live in, but the vast majority of PC users aren't that rich. Most multi-monitor setups are people who have bought a newer/better monitor and kept their old one, and no matter how crazy it is, HDMI monitors are still more common than DP monitors despite DP being both free and arguably better - and that has been true for a decade or more. There are also quite a few people with HDMI monitors + a HDMI TV nearby that they'd like the option to connect to. Of course, the $15 adapter argument works just as well with them, hence my ultimate point being that single-row I/O on GPUs is a feature, not a bug.