Thank you for your post.
Currently, you can use the Permission Set Editor in The Welkin Suite for Windows. We are going to add this functionality to the Mac version of the IDE soon.
Also, based on feedback from our users, we understand that we can change some approaches and improve the existing state of the Permission Set Editor that is already implemented in the PC version of the IDE, and we want to make these changes before adding the Editor to TWS for Mac so that it could bring more functionality benefits to a working process in the IDE. And this can take some time.
In general, the nearest months we will work on improving and extending the functionality for Salesforce Admins, and we will be happy to hear your common/painful flows so that we could handle them in The Welkin Suite IDE - in a frame of this you can also share your experience related to Permission Sets.