This hasn't been true for... ~6 years? And even then, it could block them, it just couldn't block their network download until... like 6 years ago or longer.
>I have no idea why chrome doesn't support plugins on Android; they said they'd do it years ago.
Chrome is removing all support for all plugins [see the deprecation policy they're about to introduce for Flash], but I suspect you're talking about extensions. I suspect they're coming very, very soon. They've been changing the desktop extension UI slightly and slowly and I suspect it's about enabling extensions on other form factors.
Not to mention this discussion is about using an app written for Chrome, not about somehow being forced to use Chrome for day-to-day browsing. I could (and do) use Chrome apps at times without actually using Chrome. I flip flop between Chrome and Firefox for months sometimes.
I don't get it
I am typing this on Mozilla Firefox but I can see the draws of Chrome as a platform. I personally love the distraction that working on the plumbing on different platform involves but I would rather the people who work on secure communications -- that journalists, politicians, and policy makers, and social influencers in general can trust with their lives -- not be distracted by the fun plumbing.
The way I see it, we have to abstract it at some level. If systems folks can't agree on a standard, then applications will standardize on apps that live on top of them.