A fully integrated platform lets you sell libraries, infrastructure and support all in one package.
Rather than you configuring a Laravel storage provider to use Redis and your developer configuring infra and permissions, you could just click a checkbox in an admin panel. The service could even generate you code to act as your interface.
Rather than setting up a log provider to go to OpenTelemetry and having an exporter pipe to Datadog, you hit a button which replaces the logger in your DI stack with all the wiring handled already.
For an org that wants to move FAST it could be a really compelling product. It's also very tight vendor lock in. For some contexts, that's absolutely fine.
It's something I had an idea of doing in the NodeJS space, but I'm too wary to start my own startup. Basically designing a combined DI framework and bundling tool, then selling infrastructure adapters on top of that.