Why are the controls for this game so uncomfortable to use?

I do not like having to remove my left hand or right hand away from their respected important positions on the keyboard (Moving/Aiming) to do something as easy as changing the range on my weapon to fire HE M203 rounds from 200 Meters to 100 Meters.
Why not just add one key on the keyboard to hold and use the mouse scroll up and down to select a range?

Why are there so many different keys needed to adjust speeds of player movement? If the mouse scroll was actually used properly, a lot of these headaches could be solved!

Like I would prefer if I could bind the mouse scroll up and down to adjust my soldier stance, rather than using CTRL+W or CTRL+S.

But I can't because it conflicts with the ingame action menu which is needed to do a variety of things like open doors, pick certain items up or even change weapons!

In fact, the way the current system is implemented, it makes playing this game very uncomfortable!

Grenade Launcher and fire selector should never be the same key!

The voice communications system is terrible as well, I have to manually change channels in order to just speak to people in my own vehicle? Why is it not done automatically? Should only be two voice channels! One for local and one for squad radio! The Squad/Team Leaders should have a extra one called Command Radio. It should be simple!

THE SQUAD COMMUNICATIONS SYSTEM USING ALL THE NUMBER KEYS IS COMPLETELY USELESS AND LAYOUT IS TERRIBLE. EVEN USING THE NUMBERS, IT TAKES TOO LONG TO ISSUE ORDERS.

Please make the game interface more user friendly. It is fustrating sometimes to even use the compass to tell friendlies where enemies are located because I have to hold K, and cannot do that because it is far away from the WASD keys, and my other hand is on the mouse.

Editing the game controls to custom keybinds is like a friggen chore on its own, to ensure you don't have something conflicting another key bind or binds!