.NET MAUI and Blazor – Best of both modern technologies for Mobile, Desktop, and Web solutions from a single codebase.
But app development is of two categories: Existing ones and Greenfield development. New features can be part of the latter quite easily as they’re done from scratch but definitely not that easy on the former as existing investments need to be protected. Changes can be quite expensive as they need to be thoroughly validated before rolling out to production use.