So Flask like Django also uses a templating language, called Jinja . Which from what I've read is similar to Django's templating language. So maybe I should rethink my rethink? However in Flask's favor, Jinja IMHO, based on very preliminary research, is to use their words, modeled after Django’s templates. A more powerful Django templating language? It's starting to seem that a templating language is just a fact of life outside basic HTML. They say...
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Also other projects such as Ansible uses Jinja2.