Mines and tank Traps

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No, I don't feel that way. You still can place mine in certain assault zones: These in your back! Of course you can't place mines in a hot zone that is under constant fire and ran over again and again. That would be too easy for that player who controls the zone for the first time. And it would result in constant artillery fire on that place to clear the mines.

Engineers are not worthless, place the mines in areas where you expect fast counterattacks by light verhicles or inflitrating infantry. Place obstacles to guide the enemy into the mine field. Mines are defensive weapons, they are worthless on the offense (as long as you can't throw them into enemy controlled area). So in case you know you overextended your advance and expect a decisive blow against your troops, just start placing a minefield a bit behind them, so you can retreat safely and let the enemy run into the traps.

Reducing the installation time means more obstacles and that would let the field end up in a maze of steel, barbed wire and mines - and tracked tanks.