The short answer is that anonymity as an eventual optional feature (e.g. something you could select for some transactions and choose not to use for others) appears to be favored by developers rather than the idea of mandatory application (which would apply anonymity to every transaction).
I'm not sure what developers you're talking about but anonymity loves company. Good privacy should be a default, if it can't be then it's probably to inefficient to give much improvement. Infrequently used privacy systems which are detectable risk raising suspicion and censorship for there mere use. (One of the attractions of CoinJoin and CoinSwap is that they're potentially indistinguishable from ordinary transactions)