would be better than the battery swap option which has some big hurdles. For instance all vehicles would have to have the same battery pack, but even the several companies now all have different battery packs. Even different cars by the same manufacturers use different battery packs. Plus they pack them into all of the open nooks and crannies, so they don't all just pop in and out easily.
If they really can rapid charge these solid state batteries in anywhere near the charging time their claiming it would be a major breakthrough... especially if they are as energy dense as they claim.
http://www.zerohedge.com/news/2017-11-16/tesla-killer