This 2014 recap [2] of a comScore report notes that more than half of all smartphone users download 0 new apps a month -- this started the catchphrase that "the average user downloads 0 new apps a month", which has both been supported and challenged by additional analyses on old and new data every year since. Whether it's 0 or 1.5 [3] isn't the point -- the growth is measly.
Aside from a select runaway hits, most of today's most used apps are the same as 4, 5 years ago. The app boom has been over for a long time. Occasionally, one can still strike it rich, but it's the exception, and not the norm.
[1] http://www.forbes.com/sites/parmyolson/2014/02/19/exclusive-...
[2] https://www.quora.com/How-was-WhatsApp-built
[3] https://www.tune.com/blog/no-the-average-american-does-not-d...
Even those that are, they can access the full spectrum of OS APIs, instead of a document model bended to be a VM.