Not being able to reverse park is actually bloody dangerous. Imagine needing to park on a drive off a main road and having to reverse into traffic and that's just one scenario.
I can reverse park, but though I know I'm not supposed to, I park forwards onto my drive on a b road and reverse off.
Why? Because my drive is where there's a queue for traffic lights. If I try to reverse park on at most times of day, people just do not get that I'm positioning myself to reverse onto the drive. If they do, they don't always react sensibly anyway - they start reversing blindly towards cars behind them without looking to accommodate me. Or someone 'nips around' the car waiting for me.
In fact, when parking forwards I frequently have people think I'm aiming for the next house along and do the same 'reversing to accommodate me (getting in my way and really, REALLY stupid - from my road position and drive shape I couldn't possibly be heading anywhere else).
If I park on forwards, I can reverse off safely, because the traffic is slowing for the lights, I go when someone lets me, and I have good visibility in both directions.