It is incredibly hard and a giant overhead on each of these SaaS startups to do marketing and enterprise sales which shows up in pricing (30-70%!) These solutions still need to be vendored in and integrated at each client.

Rolling up all the YC single-feature SaaS business into a single sales org and providing an a la carte set of solutions to partners would make a ton of sense.

I guess that is the theory behind SaaS.group and its ilk.