Well, Persuivant, you can do use these tactics to a certain extent indeed.. just not all of them, sadly..
Alot of maps are not really suited to do so, which makes real 'hull down' situations and flanking sometimes hard.
Cover and moving under cover - yes thanks to the wonderful view system that is quite possible in WoT, often you won't even see a tank until it is within 100m of you, out of that range, thanks to the game's camo system they will simply vanish into thin air
And it can be used somewhat for some ambushing, with low profile tanks which have a high camo bonus, plus 100% trained crew in 'camo skill' and a camo-net applied to your tank, you're able to be invisible for up to 50m distance in some situations.
Smokescreens however are not in this game.
Your fifth point - driving and fighting realistically will probably lead to your own destruction very soon, there is a gun view (called sniper view), and it does limit your situational awareness alot. But if that is such a good idea to use it all the time - I don't think so, if you are in a game with 2 teams consisting of mostly 15 other random people, minus yourself.
That is where the WoT teamplay often fails badly - sad enough.

Platooning is an option, 2 man platoons for non-premium users and 3 man platoons for premium account users.
Or engage in clan warfare..
As said; many tank tactics can be applied, proper positioning, angling, cover, flanking, bunny-hopping/overwatch/bounds-advancing, backward movement, circling and the proper use/abuse of weakspots on any target, and even ammo selection.
The mileage however varies per map - and there is currently no control in what map you are going to play or want to play (or even DON'T want to play)