Funny, I was just pondering this yesterday: whether to "upgrade" to the LG, Phillips or Dell 40+" IPS monitors, or whether to stay with my Samsung 40" TVs (UN40JU6400, 2015 models--later models have annoying misfeatures), which I have in all 3 home offices.

These Samsung TVs, once configured properly (Source > HDMI 1 > Tools, select device type as PC, turn off HDMI UHD Color (which blurs), turn on Dynamic Color as well), are excellent, and at the 28" viewing distance I use, are absolutely crisp (no pixels visible) in Retina mode under macOS.

And I'm using it over HDMI 30Hz with absolutely no flicker, and no (discernible) mouse lag.

The 2015 models don't lose their mind when the Mac goes to sleep, unlike the later models, which require re-configuring each time (the TV "forgets" the HDMI port).

Can't recommend them more, especially since you can get these older models refurbished for $400.