I think what people sometimes fail to realize is that the software ecosystem has simply become more specialized. There is now a higher-bar due to the competition between entrenched technology companies with armies of engineers continuously optimizing everything. So, depending on the industry/domain - aside from a useful product you need to consider a lot more: apps that work across platforms, performance, security, compliance, SEO/marketing, analytics, speed of iteration/delivery, infrastructure reliability, etc. All these contribute requirements that add complication.

So if you want a company that can do all that you are going to need specialists which typically come wielding specialized technologies. You can probably get away with generalists wielding 'boring' technologies for some period of time combined with SaaS solutions but it's hard to avoid the fast-moving increasingly specialized ecosystem forever.