As designers rush to reduce the complexity of the interfaces they happen to be working on, they sometimes fall into the rut of oversimplifying content and interactions resulting in an effective and un-impactful user journey.
There is no universal rule that dictates the 'perfect' level of information density.
The appeal of an interface depends on how well the web development company has managed context, content, audience catch-points, and screen size.
Issues regarding usability and comprehension can arise if the information density of the app isn't tailored to the screen size.
Maintaining visual hierarchy is also of prime importance, given that it helps a viewer navigate through your interface.
A mobile interface doesn't need to be sparse to be considered appealing.