The best thing about cosmic js is that it allows me to write code in my favorite language (Python) and then deploy it as static html files which are hosted by cosmic js. It also allows me to use its api to make changes to my site easily. I don't like the fact that I have to use python for writing the HTML files. I think it could be made easier so that we can just write pure HTML/CSS and not have to worry about writing Python scripts. Also, I would prefer if there was an option to get my own domain name. We were using it to create custom landing pages for our clients.