MY personal reason I like Angular (haven't had time to look into the others, sorry, but most I assume fit this bill) is that I don't need a server, I can put my application up on a static hosting site, and worry about what is happening in my controller/html/css/etc I like that approach. Putting a server that you now have to maintain is just one reason I wouldn't want to use it. I Love Firebase/Sendgrid/etc because I can write a client side only app exclusively, and let people who are good at databases,email,etc manage the back end. Is it a poor approach? Maybe, but when you only have an hour here and an hour there to build things, spending 6 months just setting up a few simple things seems crazy. Getting to a working application quickly for me is the goal. (I am not amazing with databases, so something like firebase gives me database with ease, and I don't have to figure out how to setup a server, figure out the database, figure out where to host... Same goes for email providers, etc)