And there are too many competing anonymous coins, so it is dilutive and confusing.
This almost seems like deliberate FUD
Right now DRK and XMR are the only ones getting any real attention. That is not a statement of merit about the others, just that they are so small and obscure, they can't really be confusing any noobs (BBR for example is #49 on coinmarketcap). Honestly even XMR is much less well known than DRK.
There's other in the top 20 of marketcap (XC, BTCD) that claim anonymity ... I have no idea whether their claims have any merit.