You don't have to use it -- each part of web.py is completely separate
from the others. But you're right, it is "yet another template
language". And I'm not going to apologize for it.

The goal of web.py is to build the ideal way to make web apps. If
reinventing old things with only small differences were necessary to
achieve this goal, I would defend reinventing them. The difference
between the ideal way and the almost-ideal way is, as Mark Twain
suggested, the difference between the lighting and the lightning bug.

But these aren't just small differences. Instead of exposing Python
objects, web.py allows you to build HTTP responses. Instead of trying
to make the database look like an object, web.py makes the database
easier to use. And instead of coming up with yet another way to write
HTML, the web.py template system tries to bring Python into HTML. Not
many other people are really trying to do that.

You can disagree that these ways are better and say why. But simply
criticizing them for being different is a waste of time. Yes, they are
different. That's the whole point.