- Rails/Angular go a long way to speeding up development due to the number of 3rd party libraries available for them. Need User logins? Devise. Need queue processing? Sidekiq. AngularJS is going the same way as Rails for awesome 3rd party libraries.
- Bootstrap almost solves visual design for prototypes, and it's not hard to start customising the templates or even buying a 3rd party one off the shelf. It's not going to win any awards for graphic design but it's fine for 99% of people that will be using your site.
Case in point, I built http://www.knowyourgenre.com, as site for exploring music by genres, in around 3 months (with a lot of backtracking and taking bits out that I didn't wind up using).
1 person, I did the front end, back end and graphic design for it.
Not to say that grow is a bad idea, but I don't agree with the argument that 1 person can't build a site anymore, in fact I think it's getting easier.