Yes, it makes sense to disable extension with that kind of application. My point is I already see they have whitelisted LastPass and couple more extension on BPP. The thing doesn't make sense to me is why they have decided to whitelisted those extension. They are private, closed source and not audited apps. I believe they could pose more risk than any other open sourced apps. If you completely disabled "all" extensions I am ok with that. I just can't think reasonable explanation why you don't whitelist open-sourced audited apps!
Anyway, that's just my point. I wish some of the mods or admins could give me some explanations or explain to me is there any way to submit whitelisting extension request for BPP.