Which is absolutely not the fault of Jira. Jira does not make you create 20 boards and per default a Title is all you need to create a Ticket. By the complaints own wording they had 2000 tickets because management refused to delete outdated and irrelevant tickets.
A new tool would not fix this since I would bet that management would insist that all 20 boards with all tickets in the backlog would need to be transitioned to the new tool. The mandatory fields are obviously also highly important to management, those need to be configured in the new tool as well.
Instead of complaining about the obviously bad management they just complain about Jira. That is, I think, very common when complaining about jira.