I disagree. Yes the web is also competitive but it's 100x easier for a simple reason:
The next site ia just ONE single click away. The next app is few clicks and a download away, even without any sign-up, an app install is a gigantic conversion breaker. This is not comparable with websites at all. Anyone who does new apps in 2017 must have a good plan.
We primarely discussed the user acquisition costs in this thread and I pointed out a huge conversion breaker in the acquisition funnel of mobile which just let the costs skyrocket. If users stick or not after being acquired is as important but another discussion (rentention & churn).
But the funnel till this point you mention is MUCH cheaper on the web than on mobile (where people also install and deinstall right away or never use that app). And this 'being cheaper' is the whole discussion around.
The next site ia just ONE single click away. The next app is few clicks and a download away, even without any sign-up, an app install is a gigantic conversion breaker. This is not comparable with websites at all. Anyone who does new apps in 2017 must have a good plan.