Flash and other plugins are a completely different thing. Running flash is not a core functionality of the browser. Making HTTP requests and rendering HTML is.
Browser vendors have already inserted themselves into this role by selectively blocking Flash, messing around with how certificates are presented by the browser to imply certain things ("green lock == safe") when no such implication can be made, blocking and/or allowing ad blockers, etc.
Maybe you're too young to remember when everyone had to update their Flash installations every week because that product was improperly sandboxed, so you think that the issue was purely battery related. Blocking and restricting flash is as much about security as battery, more-so in my opinion.
But OK, let's compromise -- rather than preventing connections to Wordpress sites, maybe they could draw a big red line through a picture of the Wordpress logo, and then perhaps warn the user that this site is or soon will be serving malware.
> And stopping: Windows Security Center Service Windows Defender Windows Update Service Windows Error Reporting Service and BITS
Won't these actions require administrator privileges? How do the program escalate its privilege if it starts by user clicking on a js file?
http://www.pretentiousname.com/misc/win7_uac_whitelist2.html
If UAC is set to Medium (the default).
If you're serious about security you should set it to High.