Isn't RNASeq more like looking at really verbose log messages? Where you only sample 1% of the log messages and may be looking for an event that happens 0.01% of the time?
That said, the downside of the Oxford Nanopore for RNA-seq is that, while you get longer reads, it's not yet really clear how many reads you get, which is at least as important for trying to find those moderate-lowly expressed genes.