Back in the nineties, we had a simple rule of thumb for estimating how many different apps a company would have to manage: One app for every ten users. (e.g. a 5,000-person company had about 500 apps, etc.)
The total app count was reasonable enough that IT could vet each application, understand its security implications, manage its lifecycle, and sleep reasonably well at night.
In 2025, people are starting to realize that ratio no longer applies.