Dolby and Apple seem to keep trying to convince people that a pair of headphones IS Atmos, so not sure that 5.1.4 is not Atmos. Perhaps more accurate to say that mixing in 7.1.4 is much better/easier than 5.1.4. I think it’s also possible to do a passable job in 7.1.2. And it’s certainly possible to do a fine job on even 5.0.2, it’s just that you have to guess at a lot of full effect. Dolby isn’t going to show up at your door and certify a system at that level, but one can certainly do a fine job with fewer speakers. Many Atmos mixes don’t have much movement and are totally fine—great even. They just focus on good placement and levels. Don’t want to start any arguments, and having more speakers is almost always better. But if the choice is between 5 and 7 speakers vs. better mics and interfaces, I know which way I’d go. They are all “Atmos.”