I've been a YTTV user for several years. If you've only just begun using YTTV, here's a few tidbits you can look forward to...
One or more episodes in your DVR that you've watched weeks (or months) ago will suddenly be marked "unwatched." As a special bonus, you can't mark them "watched" on your smart TV - you'll have to 1) start the program and fast forward to the end (and I've seen this method fail), or 2) open YTTV in your computer web browser where you can scroll through the episodes and mark them "watched."
If you're watching a program from your DVR and something pops-up that forces you to stop watching, chances are the program will be considered "watched" and disappear from your DVR. You'll have to find it in the "Most Watched" of "Shows" section to rejoin.
YTTV just recently decided to add a recap of ►EVERY◄ NFL game each week. You didn't ask for it. Some programmer somewhere decided you'd love this new feature. Since there's no way to mark them "watched" on your smart TV, you'll need to use your computer to browse your DVR, and mark each-and-every recap "watched." No - there's no option to mark the entire DVR folder "watched." ENJOY!
On the plus side YTTV allows you to change the order of channels in your live guide. You can also hide those channels you wouldn't be caught dead watching in your current lifetime. I don't know if Hulu does this.
Pro Tip: While browsing your Live Guide you can LEFT arrow (◄-) on your controller to highlight the network logo on the left edge (e.g. ABC) and select it to open a listing of On Demand shows available for the network.
I set "Yellowstone" to be recorded. Not one episode has shown up in my DVR. I can open the On Demand for CBS and watch episodes, but they just don't get added to my DVR. As programmers say, it's not a bug, it's a feature.
We've liked (not loved) YTTV since 2018. On November 23 were switching to Hulu+Disney+Live TV. There are programs on Hulu and Disney+ we watch, and switching reduces our costs by about $10 and more importantly, we'll get the History Channel (Oak Island, Pawn Stars, etc). Being old, retired, and cheap it makes sense. Hey, it's like getting an (almost) free foot long sub every month! Overall, we'd not hesitate to recommend YTTV, it's been a good value.