Wall Lights

I have been fitting various wall lights and I have not been very impressed with any of them. These are the problems I have found :

1. For the types where the connections are made behind the fitting, there is insufficient space left for a decent bit of cable, plus the connectors, plus the flex to the bulb holder. Usually the back of the fitting is hollowed out for this, but never enough. I don't like to cut the cable coming out of the wall off too short, just in case a change of fitting in later life needs more. This excess cable has to go somewhere.
2. For the fittings where the cable is threaded through a hole to make connection front-side, the hole is never in the middle. This is a total pain in, for example, an alcove, where great effort has been made to get the cable exit from the wall dead centre, but the wall light ends up offset to one side. Alternatively, and this is my approach, I have channeled out the plaster to get it back in the middle. Arghhhhh.
3. Some fittings have pressings around the screw holes that space the back plate away from the wall. This is to allow cable clearance. Great. Or it would be, if it was deep enough. More channelling of plaster. More Arghhhhh.

Oh, and while we are in moaning mode, why are modern emulsion paints so easily marked ? Trying to squash the gubbins into the back of the wall lights in the lounge resulted in accidental contact with the wall and an instant black mark. I think I had to retouch the paintwork around every one of them.