[2019] Why do you keep playing Warframe after experiencing the content?

Since this topic has come full circle several times without constructive discussion, it is getting locked.

I should like to note that people play games for various reasons. When a topic turns to judgement or criticism of a players life or choices, such discussions inevitably turn out to be far from constructive at best and downright abusive at worst. Please keep such discussions constructive and civil.

Thanks.