JSF doesn't need to work with JSPs. The component model works well with other template frameworks.
So, no, JSF is not at all "just a tag library".
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
I found some pretty shells, some sea glass and this lovely tiny ad: