First of all, overall I am very happy with the customization options for weapons and clothing. As an active serving member of the Canadian Forces, it's nice to see that I can have an M4 Rifle with a green stock, grip, and scope, much like my service rifle (It would be cool to get an M16A2 in game but that's another story). Hell, if you want to add a C7A2 rifle, and even a C8A2 to support your Canadian allies, I wouldn't complain. Or at least, a C79 Optical Sight.

I digress, and I'll cut to the chase.
National Flag patches: Not sure if this is slated for the final release, but one thing I loved about Wildlands was the flag patches. With players around the world, it was really cool to be able to rock a patch to respresent the country that you live in. That being said, a rectangular flag, as opposed to a shield one, would be more realistic and would honestly allow me to create my complete work uniform with the already great clothing options in-game.

The second point is actually quick:
In-game menu. When scrolling through the menu, I find that having the floating info box tends to block other options in the menu. Perhaps it would be better to have a static one off to the side.

Two additional that have already been mentioned: Clothing previews like in Wildlands, and classic helicopter controls. I'm 10x better with the classic controls and I know there are many like me.

Thanks for reading! The biggest thing for me is definitely the flags.

Cheers!