I agree, it doesn't work.
That being said we actually won the ball back 7 times from Brighton in their own third yesterday. Know how many times Brighton took it off our defenders? 0.
The issue is Lampard's build up. In the 433 he has two of the midfielders basically running away to the no.6 who is the one who's on the ball. That's fine if that no.6 has amazing passing ability but none of the players we have there do. Onana doesn't, Gana certainly doesn't, and Iwobi has never been a good long passer. Garner might have it, but he's A) not fit, and B) very raw.
That's on Lampard, and he needs to recognise it's not the way to play a 433 with this set of players. 433 shouldn't be played that way with good players, never mind the tosh we have.