For me blank pages happen with content blockers because the content is hidden and there's some CSS animation which unblocks it after 8s if the JS hasn't loaded. 8s might be longer than someone is willing to wait, and either way is always slower than just rendering the content that's already there, sans JS.
Note that "content blocker" is congruent to "resource failed to load", which could always happen.
Note that "content blocker" is congruent to "resource failed to load", which could always happen.