I'm sure with time we will find some disadvantages of stainless steel - such as lower scratch resistance unless made really hard with chromium - but those are solvable IMHO and all the advantages are stacked up a mile high already...
Thanks for the great write-up.
I have a "little" experience with SS from it's use in medical applications. From a service standpoint, it is a fastener issue. To avoid dissimilar metals issues, the fastening system needs to be carefully planned.
SS screws and bolts don't tolerate sloppy procedures like steel will. SS breaks and/or can bind up through galling when fastening is required. Anything that might require servicing or replacement must be planned out where fastening is concerned. Tesla has experience with dissimilar metals issues when working with Aluminum so this is familiar ground and it will be interesting to see what they work out.
SS will corrode but it takes a LOT salt exposure to do it.
It is going to be exciting to see how Tesla innovation moves this technology forward because it has so much potential.