Honestly, do not use ICC profiles that were not made with your TV. Even someone elses settings are a suspect. Every TV is unique and someone elses profile and settings can make them more inaccurate. Hell calibration values even drift over time and have to be recalibrated, so an ICC profile that you have made now may no longer be as accurate year later.
That said high end TV's usually have quite accurate factory calibrations in their cinema profiles. Very little adjustment is needed unless you are a cinemaphile like me.
And only color managed applications make full use of ICC profile. The rest like Windows desktop and some games (Borderless mode only, fullscreen overrides it) only use color temperature and gamma fix portion of the profile. Unfortunately many games even reset the profile (because of their in-game brightness/gamma sliders are implemented) unless you lock it down with 3rd party application.
Unless you know that you need an ICC profile for some application OR you absolutely cannot get satisfyingly accurate color temperature and gamma with TV settings alone then do not bother with them.
What if it becomes 50% accurate tho...I know what you mean by everything being different. But my brain just tells me if out of the box is 75% accurate. Post calibration is 95% accurate. Then even if it's off cuz of the setting/panel being totally different... it's still an improvement.
Bear in mind ICC barely affects anything. Thats why sRGB modes or at the very least good factory calibration are important.