[peller]

Wordpress is technically capable of being used to build large apps, but, you're going to be rolling your own everything. Whereas a framework, is, well, a framework that has standardized and cleanly extensible ways of doing core functionalities X, Y, and Z.

Wordpress is old, and they've built up a shit-ton of technical debt for the sake of BC. To put it bluntly, it's not a pleasure to work with, at all. On the up side, something like 20% of the surface net runs on Wordpress. There's a huge market for WP skills, and it's got enormous mindshare amongst non-technical types. If you want to invest effort in WP, do it because of the adoption metrics; if you're more technically oriented, pick Django (or Laravel/Symfony if PHP is more your speed).