1 round is 100s till planting and extra 45 seconds once planted. That gives 145 sec including post plant.
Now if I spam non stop its still 7 only. This is assuming no-one breaks it.
You're just wrong.
Being able to use it as a fake flash to throw off the enemy's crosshair already makes it more versatile than a regular flash, plus it also provides info, making it useful in any scenario.