Fair summary!
Just a few responses.
Navigation map: This was changed to what you see in RFB because maps of this area available were not detailed at all. In fact, some maps were swiped from old National Geographics or old school text books. Sometimes they got lucky and found a map on POW pulled from the water. So, RFB went for the not so informative map as it was.
Locking scope or not locking scope. Since the patch it is not so bad. At least not like it was when you were sitting on top of the vessel and could not lock. You know what though, I studied Rockin Robins Dick O'Kane method and have not used lock since. I do not think I will from here on out. Give that method a try and you will see that locking the vessel button is wasted space.
Sounds: I change my interior sound. The RFB interior sound makes my head hurt after a while. I can live with the low engine sounds. There are programs out there that allow you to adjust volumes. Ask RDP what he uses. Make yourself your own personal sound mod
Fuel: Never been a problem for me. I guess you are heavy on the throttle
DD: Yes, I wish they were a bit more aggressive but every now and then you get that killer DD that will chase you to hells gates.
I think there is a good mix of deadly DD to stupid DD.
Anyway, more coming for RFB and posts like this that do not start with "RFB SUCKS" go much further! Join the RFB forum and post your likes or dislikes. This is how things get better.