I'd be happy to start on that, if you'd like.
I don't think tariffs should be mandatory. To speak from a university perspective, I think there are options for tariffs and for ways to clear copyright. Right now Access Copyright is but one collective. There are a variety of different ways that you can gain licences.
We had some issues with Access Copyright in terms of transactional licences, for example. We're not able to obtain them. It was an all-or-none approach to licensing, so we found that we were paying for licences twice. Furthermore, we also found that their repertoire was not transparent. It was difficult to know exactly what we had paid for.