Your suggestion is tantamount to forcing people to be smart... I don't have to explain my stance on that. ;-)
By selling iMacs, Apple are not *forcing* people to use an "all in one" computer. They are a contributing one option in a wider marketplace.
By offering a comprehesively anonymous network, DRK is not *forcing* anyone to use anonymous transactions. Likeways, they are offering *one* distinct type of product in a diverse marketplace.
Those arguments would only apply if DRK was the only crypto around. It isn't so they can't be accused of not offering choice when in fact that's exactly what they are doing within the wider marketplace.
Apple also sold NOT iMacs. Choice.
I'd be irritated if DRK client forced me to use DarkSend. I'd use it all the time anyway... But being forced to do a thing just plain pisses me off and makes me want to hurt people.
DRK can give people a choice WITHOUT pushing them out of DRK to do it.
A.k.a.; If all Apple ever sold were iMacs, they would probably have gone out of business. Do we want to push people off of DRK when we can give them a choice in-house instead?
And again, I re-iterate, the only reason I have two 20nm Neptunes on the way is because I will dump BTC for DRK. BTC has become a dump coin... No X11 miner? Ad-hock multipool...