You asked to name a "generic issue tracker", not a "sophisticated software development methodology tracker".
With 142,000 "generic issues" tracked to date (mostly software and network support, with 1 to 100s of replies per issue), we haven't run into a wall yet.
We don't use RT as our primary software dev tracker. We use it as a generic issue tracker.
I'll agree with you - if what you are looking for is straight forward ticketing and issue tracking, RT rocks. Quick question (it's been a while) - do they have a free-text search engine like lucene that lets you search all the comments/tickets? That's probably near the top of my list of things I love about Jira - it's insanely fast search capability of all the comments/summaries.
With 142,000 "generic issues" tracked to date (mostly software and network support, with 1 to 100s of replies per issue), we haven't run into a wall yet.
We don't use RT as our primary software dev tracker. We use it as a generic issue tracker.