Can agree. My $1800 TV has the slowest interface ever and only 8GB of storage space, most of it being taken up by the OS. It's laggy as hell and a major pain in the ass to navigate cause of it. It's like using a $50 Android phone that keeps closing the app you're using cause it has 512MB of RAM.
I've given up on smart TVs. Mine has never been connected to the internet. I slap a fire TV to it (yeah, I know. I'm weak...) and forget about it. If that gets too slow for the task I'll get a new one for 40€.
For that price you can buy good monitor. For that price you can buy small computer.
For double that price you will never need to think about replacing TV because "it's got too slow"
I once had a 200" Sony CRT projector. It had a grid of at least 20 trimpots for adjusting the picture on each of the tubes (RGB) and after 45min to an hour of warming up and tweaking it was an unbelievable picture. Then a 300v DC rail shorted to some logic level stuff and it caught fire :(