Hi I own the Altair 2 (for about 60 days now) and have heard the Arrakis locally at a friends (he has the active version, external cross over with 4 VTL amps and 2 REL subs) We also have similar sized rooms (mine is 30 ft long by about 20 wide) I don't listen to a lot of recordings with super low bass (like pipe organs) I listen to mostly jazz and some chamber music and the typical current Norah Jones or Sarah Mclaughlin. I am very happy with my Altrairs with no sub and seem to be getting excellent deep bass. My room is also well treated via a custom Rives Audio plan...
I do feel that a simpler system has some advantages over a external cross over with more amps and connections...but this set up to has advantages...I suspect in dynamics and ease of presentation - once set up properly and tuned.
I have not heard the Magico Q7s or the Tidals. I have heard the Wilson Alexandria X2's and the large Focal's. One advantage that you have consider on the Wilson's and Focal's is their adjustability. Which can be a significant advantage in nearfield or far set ups.
How big is the room you plan to install these speakers? I think the issue is how far do you want to scale down ... Magic, Rockport, Tidal, Wilson, Focal all a top notch. I've never been a fan of systems with different amps types on the bass, mids, and top end. I am sure you can get all this to sound wonderful...but more time adjusting/tuning...and more variables to creep in like the speed or signature of diff amps. It's why I am a fan of Porsche 911's. You can get more power, better brakes or better this or that...the the package is very complete and does everything nearly the best. The sum of the parts is more that the whole...this car has balance of all the attributes you care about.
I've heard a set up frequently over the years...used to be Dali Megalines, custom external tube cross over, 4 VTL tube amps, 2 JL Audio subs, complete set of Purist Audio 25th anniversary cables everywhere. It was just a killer good system. Then he recently "downsized" to the top of the line Focal's - Grand Utopia EM's. No subs, just 2 VTL amps, no external cross over. Now the speakers changed...but I'd take this "simpler" system...to me it just sounds better (if you haven't heard the newer Focal's...this is speaker to add to your list)
Here

is a pic of my room with the Rockport Altair's installed....