I don't know how much of a problem it really is, I haven't seem widespread issues. Having said that, I'm sure if I google searched I'd find a fair share of problems, then again if I google something I can find a fair share of problems with anything...my fingers are hurting a little bit while typing this, if I google it I'm sure I'll find I have finger cancer.
Manufacturers can negate LSPI a bit by adding fuel, which of course impedes the fuel economy direct injection is supposed to provide, but the manufacturers don't car, you already bought the car and they won't stand behind fuel economy estimations. They can also provide updates which will further effect performance.
Oil is not supposed to be the only answer, only a partial solution in the fuel droplet catergory. Who knows?
I've owned two direct injection cars...one developed oil consumption and hesitation issues. The other does feel like there is some low speed preignition going on when the engine is cold...it's a fish biting feeling/effect...as if a fish is biting on your line. I'm able to snap out of it with more gas or when the engine heats up...is it LSPI? Not sure, but everying^^^ above never happened to me before direct injection. Years from now mechanics are going to tell old wise tales about the early days of direct injection, and how sucky it was. Then they'll all just laugh and laugh.