To me if really depends on what the buyer's priority is for the TV is.
If size is more important than features and future-proof tech like OLED, HDR, Picture quality, then getting an entry level LED TV at that size is more logical and cost effective. And LED TVs have matured for a long time so all the problems are gone and u can sure u are maximising the use of the TV.
Just my humble 2c.
While I agree that OLED can only improve, I need to correct the above point that all the problems of LED TVs are gone.
The fundamental disadvantages of LED TVs can only be minimized but never eliminated. Just google image LED TV technology and look at the illustrations.
It's hard to explain. But you can try this.
On a big LED TV...
1) look at the pictures directly, then shift your viewing location up down left right. You will see a slight change in brightness, color and contrast. This is worst on a big TV because you are looking at different angles for pixels in the centre of the TV and edges of the TV.
2) Try displaying a black picture and you will see light bleeding. (Unless you have a FALD LED TV) This bleeding is not uniform. This is because to create black, the LCD crystals need to be completely twisted to block all light from the back light. Complete block out is impossible.
A FALD LED TV will switch off portions of the backlight to get real blacks. But only a few top end TVs can do this.
3) Now try watching a movie with bright and dark scenes. The TV will try it's best to do both, and it will not be perfect.
4) Now try it with HDR.... In this mode, LED TV backlight operate at even higher brightness. You get vibrant colors, but the blacks will look murky.
5) Now try playing PS4 pro games with 4k HDR. The TV basically starts to struggle because it needs to do the following:
Have low input lag. This means advanced/optimal picture processing cannot be enabled. Color and motion processing will not be as good. No choice, input lag is important.
Enable HDR. means now all the LED backlight is very bright. Even if you have a FALD LED TV, it won't be perfect. It's because advanced processing of backlight control is reduced/disabled.
With OLED. Most of the LED TV issues are reduced. The only problem is that with HDR enabled, LED TV output will still look brighter. But you get awesome blacks, great colors, great viewing angles etc.