I agree with TCS!! Every time one opens the app by default it goes to Inbox and if someone uses folders, then we need to go to the hambirger to check if there are any emails in those folders. So everytime I open the app I have to go to the all folder list because I don't know if I have or not have an email in one of the folders

The request is to let the user choose what folder to default to, rather than to dictate what folder is defaulted to. Currently, Proton Mail dictates that Inbox is the default which it reverts to in endless annoying tedium for those who prefer to see All Mail (or perhaps another folder). Note that messages filtered to folders won't be noticed as new mail messages when Inbox is the default, and therefor subtlly affects the whole folders and filters paradigm.

All messages should always go to the inbox unless a filter tells it to go straight to archive. By making all mail the preferred view you also get all the archive mails which you don't want.