Apple TV 4K lacks proper resolution and refresh rate support, especially for 1440p

Any potential refresh rate upsampling can be done by the display device; no need to do that at the media player level, and send unnecessary data over HDMI. 50 (PAL) or 60 Hz (NTSC) is enough, as commercial streaming services are almost always 23.976 (24), 25 or 29.97 (30) fps; some specialty programming (sports) can be 60 fps, but nothing beyond that.

Frame rate content matching would reduce the frame rate over HDMI, to 23.976 (24), 25 or 29.97 (30) Hz, overruling the chosen 50 or 60 Hz.

Frame rate and dynamic range and chroma subsampling are tied to resolution by the bandwidth of the HDMI connection. For display devices with HDMI 2.0 ports, the limit is 18 Gbps (14.4 of actual AV data) uncompressed. For display devices with HDMI 2.1 ports, the limit is 48 Gbps (42.0 of AV actual data). Devices can be implemented with a lower limit than the HDMI spec allows for, i.e. some HDMI 2.1 ports on TVs might have a limit between HDMI 2.0 and the maximum for HDMI 2.1.

E.g.: 60 Hz, HDR10, 4:4:4 chroma, 4K would require 15.68 Gbps. Too much for HDMI 2.0, unless you specify 4:2:0 chroma instead, which is fine, as streaming video is always 4:2:0 at the source. Or when a lower frame rate (≤30 Hz) is supported through content matching.

hard to say

maybe if more people suggest they do otherwise, using their feedback channel will make then implement it

Feedback - Apple TV - Apple

to the best of our knowledge they do not scan these user helping user forums for opinion, suggestions and the likes

No one here can answer why Apple does anything. No one here works for Apple and Apple Support is not here. If the Apple TV 4K lacks the support you want then buy something else that does. No one is twisting your arm to keep the device.

Ichirare wrote:

I already filed feedback. Not many people will do the same I presume

Yeah, probably right about that.