For a single version during beta, 10.1.102.64ubuntu0.9.10.1m, Chrome beta supported a nice, elegantly working plugin blocker. In the content settings you could choose to use plugins on demand. Now in 10.1.102.65ubuntu0.9.10.1 it's disappeared again.
I think the reasons are probably the Adobe alliance allowing Google to distribute Flash with its browser and phones on the one hand and Google getting its money from advertizing. And flash ads probably just make more money. We can conclude that Chrome will probably be the last browser to include features users want but advertizers don't.