In the general case, this is to prevent a user from posting a bunch of questions about some topic without doing enough research on it. You can see this happen even with experienced users ([the infamous Tim](https://unix.stackexchange.com/users/674/tim), for example, often did this - they'd grab some new topic and then we'd see a bunch of usually trivial questions on it).

I don't think new Ubuntu releases merit an exception for this. If the problems that you have answers are truly that important, other users will post questions about them sooner or later. Just answer then. Or, find questions about the same problem which differ _only_ in the Ubuntu version, and answer there. It's a common practice here to generalise questions beyond a specific release if possible, so that's fine. (This IMO is the best option for [tag:software-installation] questions.)

In the meantime, prioritise. Decide which of the problems you don't have answers to are most important and post those. It's just a new Ubuntu release that's not being forced on anyone. There's no real need to raise the limits for that.