I used to work for a stereo company who sold concert, auditorium, and recording studio speakers (assembly line work, QC tester for the bass signal processing equipment, and sometimes drove the van to pickup cabinets). There are a lot of specifics that different music enthusiasts focus on. It seems like most people just want something that "sounds nice", and don't want to go down the sonic fidelity rabbit hole. I've tried and used more immersive setups and less expensive, simple units. Each one has it's advantages and disadvantages.
IMO, a simple soundbar with a subwoofer should satisfy 95% of those that wish to have a "nice setup" for watching TV. The simpler the better, as most people don't like to crowd onto the same seat at an exact distance or orientation all the time, pay hundreds or thousands of dollars to listen to the radio from across the room, or dedicate too much space, power, or decor to accomadate a more professional setup. Additionally, this almost gaurantees a lower quality experience for others, e.g. when you have friends over in all different places to watch a movie, or even a family spreading out along a couch. My current setup is a low budget powered soundbar with a wireless powered subwoofer I got cheap on clearance. It's fine, not great, not lowsy. The downside is that I didn't check the input/output on my TV and so I can only hook it up through my DVD/Blu-Ray player (long story; fiber optic cable).
If it is a powered speaker setup, you can also just get a separate BT adapter to connect to your phone. Additionally, these BT adapters will often work with other, older, or less expensive shelf or component systems that have the correct input. They are usually pretty cheap too. Personally, I prefer the old component systems because I could upgrade or replace whatever part I wanted to at any time, and if one part went wrong I didn't have to replace the entire setup.
I think the most important for any decent setup, is to make sure the speakers playing the higher frequencies are aimed toward the listener. Most people think about left and right angles, but many don't think about up and down angles. Many really inexpensive stereos (including the 40 year old $10 ones at GoodWill) can sound a LOT better by simply aiming the high frequency drivers at the area where people will be seated... especially aiming them up towards the listeners if mounted on the ground.
If you are looking for a more connected experience, such as something to yell at to bring movies, weather, web pages, games etc onto your TV screen, then you will probably shell out more $$$ and have to look into compatible systems. Nothing wrong with that, but you are paying for an entertainment computer plus speakers, rather than just a sound upgrade for your phone or TV.
