Everything in the DSM is made up labels for behaviours that are culturally contingent. Some of them are no doubt useful, they help people cope, get accommodations, get access to support.
But in many cases, the result is the pathologisation of normal behaviours, see diagnosing someone with Reactive Depressive Disorder for being sad their partner died, like it’s not a “disorder”, it’s just a normal reaction. And psychologisation of physical conditions where we currently don’t understand the underlying biology (so medicine doesn’t take it seriously), see Major Depressive Disorder.