Scale issues for 4K Displays

I saw someone post about this issue with the icon and text scale being reduced when you change the resolution to 4k on third party displays. Someone on that thread had mentioned that they didn't think that, that was the issue on a Dell 4k Display.

I'm here to let you know it's still an issue on those displays as well. I'm running a Dell U2718Q. It's not a high-end display, but it's still mid-range and I would love to be able to use it in 4k as it was intended. I've tried running it on DP and HDMI both and the issue is the same regardless. I've also tried this on a Samsung 4k Display to no avail.

I've tested this out on High Sierra and Mojave. I also experienced another sort of unrelated issue on Mojave, which is why I haven't reinstalled it (Mojave) yet.

I'm not sure why they aren't supporting 3rd party displays and that's really unfortunate especially with all the money they charge for their stuff.

I'm a big supporting of Apple, but they are dropping the ball on this. I would love to see more support from them instead of just focusing on the newest and greatest devices.

Especially when I purchased my Mac Pro (Brand New) with the ATI Radeon 5870 HD several years ago and they not only installed a defective card that died 1 day after receiving my system, but then the replacement cards fan that they sent started to go out 3 months later. I switched over to an Nvidia card, but since they aren't "really" supporting those cards that much anymore I've switched back to AMD's Radeon. Hopefully, I'll have better luck with this one.

I've invested a lot of money on Apple products over the years, so it would just be nice to receive a little support from them in return.

System Specs:

Mac Pro Mid-2010

2 x 3.46 Ghz 6-Core Intel Xeon

OS 10.13.6

128 GB RAM

1TB Mercury Electra 3G MAX SSD

Radeon RX 580 8Gbs

24 TB internal RAID