Ok, but who says you have to stall for any units. But UKF have better infantry, better light vehicles, earlier mediums, A not so worthless panther, better elite infantry, much better rocket arty(doctirnal) than ostheer. How are they a BAD faction???
You stall for the unit so you can get more than 1. The more of these elite anti-infantry units you have the better, since together they are more likely to wipe an enemy squad before the enemy responds - however, if you first have to get a large number of regular infantry units, you can't get more than 1 of the elite infantry units because you'll run into Man Power problems for other units like tanks and AT guns.
As for why UKF is bad:
- No stock assault troops. The only stock unit that has a close range weapon doesn't have grenades either.
- Overly punishing cover mechanics which makes Tommies very vulnerable against assault troops when caught in the open (to get decent DPS you first need to get to cover, by that time the assault troops are already in grenade throw range) and make them poor at flanking.
- No stock elite infantry
- Short on anti-tank snares compared to all other factions
- No useful stock anti-garrison tools
- Awkward healing mechanic which makes using units like snipers more micro-intensive.
- Multiple stock units are useless in 1v1s like Bofors and 14 pounders, and some stock units are exclusive which limits flexibility.
- Mortar pits aren't great and they can't be because their design sucks.