You haven't addressed the part where the ICs have to be part of the system so thoroughly. You've only addressed that project managers need to communicate with one another and with their teams, and you've only done so by using anecdotal evidence, before drawing a conclusion that JIRA is a net positive.

Again, give some actual proof. It's about time we stop clashing rationalities and face the music. If it's this easy to come to a "rational conclusion", it shouldn't be much harder to pull evidence.