The firm also scrapped a long-held belief of sticking to pre-set allocations of stocks, bonds and other assets in target-date funds.
This is active on top of active. I don't see this going well.
The Fidelity Freedom funds are already funds made up of other Fidelity active funds. This is saying that Fidelity is also playing an active market timing role in deciding how they change your allocation to the different active funds over time.
If you wanted to pick your own AA, and not leave it up to Fidelity's discretion, portfolio management would be a nightmare. You would regularly have to tweak your other holdings and/or change which Freedom fund you use. That completely defeats the point of a Target Retirement fund.
They are surprised money is leaving? The funds aren't functioning the way people expect. Of course money is leaving.