The problem is that there is a million tools for single cell transcriptomics out there, each of them appearing relevant in their own way. So it seems necessary to filter in some way, to keep the maintenance burden manageable, and also to provide the users with a pipeline containing only 'battle-tested' tools that they can rely on. Now so far I never thought about a formal way of describing the 'threshold' a package needs to fulfill (peer review/citation/GH stars) so that it is worthy of being included in the pipeline, but I am pretty sure this package would not surpass this threshold yet.