"slime line" LOL! Yes, G26/p30SK a double stack subcompact version would be awesome. I'm not convinced that the elegant, simple, and reliable action of the P-07/09 could fit into a singlestack.
Why is the G19 the gold standard? It does it all. It can be a duty gun for LE or military, a CCW, or even hold its own in competition. The 19 is big enough for a weapon mounted light. It fits full capacity 15-round magazines. Most people can shoot it fairly well with minimal training. And it's actually quite compact.
Nothing wrong with the 26, but IMO it's more of a niche gun. That might mean it's a better choice--just not the gold standard.