That is a non starter for many apps that one uses rarely but provide high value. For example delivery tracking, sftp apps, vpn apps (only used while traveling). How would widgets work? Are they on all the time or never. Ideal app to make would be a launcher because you must use that all the time, but then do they deserve more than the app you use to do your job?

I don't think that any financial model can fit all usages. Except, of course, paid up front with paid upgrades (and a subscription if there is a cloud component). But that ship has sailed.