On our way back from picking up our 21D, we stopped at Best Buy and upgraded the stock 32" Atyme (barely) HD dumb TV to a Samsung 32" 4K Smart TV.
It was a huge upgrade - picture quality is significantly better.
The audio on the Atyme TV couldn't be heard over the A/C - the Samsung has louder speakers and can be heard while the A/C is running.
And having the smart apps allows us to stream videos using our 5G hotspot and smartphones.
Though we later added a JBL 5.1 Multibeam Dolby Atmos soundbar underneath the TV that provided an even better upgrade on the sound - much richer sound and simulated surround sound (without a subwoofer).
Mounting the new TV in our 21D was a little challenging since the mount & cabinet were designed specifically for the Atyme - and any TV with a different location for the VESA mount - or a different physical configuration for the back won't easily mount and will likely require a different mounting bracket.