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MNE-pipeline or not: both could be implemented. At the moment, Guio and Saeed have decided to go for single apps. Even Alex does not recommend to use the whole pipeline as a single app. Instead, we should use the pipeline as inspiration for sequences of apps.
BIDS or not: problem is that BIDS is multisubject in essence, and BL is single file in essence.
Decision:
MNE-pipeline is well structured but too complex to be directly ported into BL.
For now Saeed and Guio develop single apps in an “as simple as possible” way.
Once they have a complete set of apps, they will need to engineer a complete BL pipeline within a project. The MNE-pipeline will be a great inspiration, especially at this stage.