Yes, of course, it’s only natural to replace a 2.1 or 2.0 HiFi system with the scam that is Dolby Atmos…

Dolby Atmos does jack shit for quality audio; I say this as an audiophile. It is extremely controversial in HiFi, and not some gold standard. Additionally, the sound bar system you linked is just a facil approximation to what Atmos is, and far, far inferior to good passive stereo bookshelf speakers of the same price (I think Elac DB52s cost about $250, plus a $70 300W per channel fosi v3 amp will get you a fantastic setup. Later you could even add a $200 sub for the <60Hz range.)

Here’s a Benn Jordan vid I found on the subject: youtu.be/5Dw3aKbw5Wo

The farthest I would ever go with surround/quadraphonic sound would be something like the Schiit Syn, which is now discontinued anyway. I have two ears: I only need to speakers. If the speakers are good and the track is well mixed, this will always lead to a better result than Dolby Atmos.

Movies like Interstellar are mixed with quiet dialogue for the dynamic range, like you say, and that can make speach difficult to understand. This is a questionable trend in movies led by Christopher Nolan but is absolutely not alleviated by Atmos.

I won’t go into what I think of the trend, but I really want to emphasize that buying an overpriced consumer sound system with Atmos marketing on it will not solve the problem. Please do not invest you money into faux-HiFi! If you are going to spend that much money, spend it wisely, and don’t pay attention to marketing.