reading some comments in this thread tells me why this is such an important deal for Google (youtube). There is still a very large segment of the market that has not jumped to streaming - a market already dominated by Netflix and Amazon, plus a host of other content providers (Apple, Hulu, Paramount+, etc). Youtube TV is (I think) a relatively small player, so something like this gets Google back in the game.
For those amongst us not streaming, you basically have 9 months to figure it out.
Personally, I jumped ship when DirecTV offered a streaming service maybe 5 or 6 years ago. It was a huge reduction in cost - like $80 -> $20, but the cost kept creeping up and up. The only difference was getting content via ethernet vs a dish. Anyways, we dropped that when the costs got to ~$50 and moved to stream only since. TV viewing is a different experience. You don't flip through the channels looking for something good, instead, you flip through a library looking for a show to binge-watch. (also, no cable news which is a net benefit).
When we first did this, I got up in my attic and hooked up a large digital TV antenna. This gives me all the local over-the-air broadcasts - ABC, CBS, NBC, FXO, PBS, etc. That's all free, and never hiccups. That is how I watch live sports - and I go to a sports bar if I want to watch something not broadcast.
There can be hiccups. Buffering, where the action pauses for a second before connecting again, is not a big deal while watching a movie but makes live sports unwatchable. Therefore, it is important you have (1) a good internet connection (2) good connection to your TV. For the second, ethernet directly to the TV is best. There is an ethernet adapter available for Firestick and I assume for Roku as well. If you can't get ethernet, I have been super impressed with my Eero mesh wifi router. One other thing I do to take it a step further is dedicating my 5ghz bandwidth to TV's only - everyone in my house can use 2.4GHz for personal use, but the TV's are on 5GHz. Not sure if it makes a difference but there is less crowding on that spectrum and therefore less likely for hiccups.
My kids will have grown up never having cable - not ever having that experience of flipping from channel to channel. It's weird, but I'm ok with it. This is the wave of the future,