I’m not sure why people compare it to Calibre here. Calibre is an insanely full featured management, editing and metadata filling software for ebooks and not build as a minimal reader. I guess the main use case is to send ebooks to your reader device from Calibre (Like a Kindle) and it’s doing that very well especially if you invest time in setting it up and using the right plugins for your use case.
You also don’t use Photoshop for browsing your images, it’s possible but it’s not what it’s made for.
You also don’t use Photoshop for browsing your images, it’s possible but it’s not what it’s made for.