After having worked four years with trunk based development and enjoying it very much, I worked on a project were it was required to have one branch per feature

After having worked four years with trunk based development and enjoying it very much, I worked on a project were it was required to have one branch per feature for review purposes. It caused lots of delays, temporary work arounds, merge conflicts, moving changes between branches, bugs being introduced, due to reviews being delayed. I got the impression it made development twice as slow and did not improve code quality.