Why Bootstrap might be very important
Bootstrap is great for what the name implies, but when you are delivering the product to the public, it's not good enough.
The perfect example is iOS apps. Can you imagine your designers simply copying and pasting from iOS's default theme? It's very bland, it turns off users before they even use it (which in effect, is bad UX. Bootstrap has both + and -, good UXer will see this and adjust accordingly/depending on the phase of the product). I use this resource for my wireframe/mockups http://www.teehanlax.com/blog/iphone-gui-psd-v4/ Personally I won't ever use it in a beta product/website as is.There's nothing wrong with bootstrapping to map out user flow, and give clear indication a button is a button, a list is a list etc. But when it's time to up your game, give access to the public, default bootstrap visual/color needs to go.Humans judge a book by its cover. If you release your bootstrap website, users will have to work and over come the barrier of your bland looking site and then decide if it's worth it to try your product.
PS: The point about lawyers have crappy websites and yet we still use them is because our expectations changes depending on the organization. Do we expect government websites to be wow and dazzle us? Do we expect a new Apple product's website to use bootstrap? Do we expect a 2 month old startup website to be featured on Behance's frontpage?And remember who your early adopters are – if it's people that scours HN or see countless bootstrapped sites, what are they going to think when they see your site? Would they be understanding and go 'Oh its okay - they're a startup, I'll give them some leeway when it comes to visual design' or 'Would they go eff this, these guys don't care about design or visuals. I'll come back later'.