Gordon,
Your comment about the guy in the attic deserves a more comprehensive response, as it goes to the heart of my philosophy.
Let's play a little mind game. Suppose the investment world is inhabited completely by experts with their CFA's, quants - and actuaries, Brendan. No one else inhabits this particular world. Now suppose expert A, with their team of quants, CFA's and actuaries, decide that they want to sell company X from their portfolio. They need to find someone to buy it, and at a price that is acceptable to them. Now we also have expert B, who also has their team of experts. They decide that they want to buy company X and add it to their portfolio. Again, they have to find someone who is prepared to sell it, and at a price acceptable to them. Thus, the teams from expert A and expert B get together (virtually of course) and agree a price P at which they complete the transaction. Everyone is happy that their experts have done a great job.
Now enter the poor guy from the attic. He just wants to buy shares in company X. He completes the transaction at the prevailing market price, which happens to be P. Thus, he gets the benefits of the accumulated expert wisdom of the teams from expert A and expert B, without paying a penny.
This is of course what the passive funds are doing, but the guy in the attic has an advantage over the passive funds. Every time there is a shift in the market, be it a rights issue, a share buyback, an IPO, et cetera, the passive fund has to buy and sell a small number of shares in every security it holds and incurs costs in so doing (incidentally, the advent of Mifid 2 has highlighted the extent of those costs, to the annoyance of Vanguard, et cetera). Meanwhile, the poor guy in the attic trundles along with his buy and hold strategy, completely oblivious to all that is happening around him and all the expert wisdom that's being bandied around. After five years, who do you think is going to be better off?