duplicated code when using django style guide pattern

[mojtabaakbari221b]

I read the django style guide section and really liked it.
Because the approach I was using was adding a lot of complexity to my projects when I thought I was saving time with generics. but the question that arises is this, There are very few packages that use this pattern, for example, the djoser package that I use in my projects is written with generics, using it leads to adding generics and complexity when customizing it. And if I don't use it, I will end up writing a lot of duplicate code for which there is a package. And this case is also true for the rest of the packages.