Does anyone have some instances or cases where onepage web applications (for example, a lot of AngularJS apps) are inferior to full loading pages? I'm not including technology, SEO, etc. Only from a pure user experience perspective.
Whether your product should be a one-page solution or a more traditional multi-page solution is entirely dependent on a whole lot of factors.
There's no way to give this question a blanket answer.
A one-page app could be designed with great UX, or terrible UX. Whether it's one page or not really has no direct bearing on the quality of the UX.
Broadly speaking, however, if your product consists of delivering 'pages' of content, then there likely is little-to-no reason to go forward as a one-page app. A one-page app is typically when your web site is designed as an actual application--when it's purpose is more utilitarian in nature rather than content-delivery.
Single page applications are perfect for dynamic content sites with a lot of asynchronous server communication. For small websites that serve information only, the development overhead in terms of time and cost would deem it unnecessary to build a single page application.
Your decision should be on a site by site basis, keeping in mind that there is a use case for both.