Why do apps request persistent access to camera roll at all? I don't want to manage a custom set of pictures. I want to send a picture now by selecting it. App

Why do apps request persistent access to camera roll at all? I don't want to manage a custom set of pictures. I want to send a picture now by selecting it. Apps like Messenger, Telegram and WhatsApp refuse to show me the regular old photo picker. I have to enable "limited access" and select the same photos twice (first add to the set, then select for sharing). It's infuriating. PS: The exception is media management apps, but those are extremely rare and irrelevant in the context of social media and communications apps.