Is it free for those with Microsoft gamepass Ultimate? If not...I'll wait out since it's a bit too much on the expensive side for my liking. I've spent a fair bit on my main flight sim, IL2 Great Battles over the years (as much as I spent on Star Citizen to be fair) and since it's purely a commercial/civilian flight sim, MSFS might not interest me as much when compared to the IL2 series which has everything from accurately modelled tanks to WW1/WW2 aircraft.
The lack of a 'mission' generator or some form of career mode would relegate it very quickly to the 'play very occasionally' games SSD for me...a bit like Eurotruck sim 2, even though that has a career mode.
First month is $1, then something like $4, so at the very least it costs peanuts to try it.
I think this game will thrive on individual and emerging content. I will definitely trace back my travels, and once I git gud, I will very interested in taking part in long distance races.
I think you'll still be able to buy the version upgrades later if you at some point decide to get the extra planes. It will probably cost a bit more than buying the deluxe version from the get go, but dilluted in time the extra cost will probably not be that much.
I am pretty certain that I will pick it up as permanent game especially once VR support will be added. I'd just prefer to buy it on Steam.
The deluxe versions: while the airports are truly some cool ones I've been to IRL, I guess it is mainly the extra planes that provide the real value. At this point I'm not that familiar with them to make a call whether any of those are a must have.