This doesn't surprise me. I think it reflects the way the industry is structured, even more than managers' talent or the fees. Most money managers don't really have the incentives to outperform (they still get paid as long as they 'fail conventionally').
Investors are to blame too - very few bother to learn about how investing works, and check fund prices too often. All this encourages benchmark-hugging.
Sadly, new financial regulations (in Europe anyway) are making it even more onerous for smaller firms to start up, blocking future young talent.
One good thing has been a new(-ish) wave of medium-sized, owner-managed mutual fund companies (usually star managers jumping ship to set up on their own) such as Fundsmith, Woodford and Lindsell Train who run relatively concentrated, off-benchmark, buy and hold portfolios.
And let's remember, some managers can do it. People just need to do their homework to work out a checklist of where to look for them (e.g. they probably won't be at Fidelity).