Voted for this as well.
One huge, very important issue I’ve not seen anybody bring up yet:
Missions being locked behind career makes them regionally location bound.
Tired of your usual career locations and want to go fly rescue missions in New Zealand for a change? Or medical transport in, let’s say, Ghana? “Well too bad, you haven’t been to NZ or Ghana in your career yet, no can do!” 
Where you’ve chosen your HQ to be, areas where you’ve flown to before and where the first missions of each new type take place make up the artificial jail in which the sim keeps you locked in. You are forced to painfully slowly make your way to all 195 countries on earth, and all their regions, to gain the right to fly missions anywhere you want.
Due to confining missions within career mode, MSFS 2024 deliberately limits where pilots can enjoy their favorite mission activities, even though it is capable of spawning them almost anywhere.
Remember when they first revealed the video snippet of the globe with mission markers all over it? What we got instead is a highly locked-down-behind-a-grind version of this. Absolutely not what I envisioned when I first heard of the phenomenal mission generation capabilities of MSFS 2024. Wasted potential and a massive disappointment. Hopefully I’m not alone with this feeling.