I could see this being interesting if you handle all the aspects of pack teardown, rebuild and recertification, and send out finished packs. Would you be comfortable with doing that and standing behind those 100%?
Asking regular people or even highly technical people to assess cell geometry, type, quality, balancing and cell capacity issues is going to result in people dying in fire. It just isn't that easy, even if you start with brand new, matched cells.
Fireproof casing sounds great, as long as it's also being charged in a fireproof bunker. Unfortunately, that's not usually the case for consumer products.
Noticing that in the video of the cell vent testing - Bosch vs. Gouach the electrical wire harness immediately turns black. If you charge this pack in a box filled with paper and a cell vents, will it start a fire?
How are you going to thoroughly test with your production parts before shipping to customers next month?