SPAs for situations where they are not needed are horrendous UX in and of themselves due to the usability issues for power users that manage JS execution via browser plugins. [e.g. uBlock]
You could disable CSS and images and call the result ugly, but I don't think that entitles you to call the website ugly?
https://gds.blog.gov.uk/2013/10/21/how-many-people-are-missi...
If you want to ignore 1% of the internet, you go right ahead.