I think this is a good argument for minimising one's identity.
But there can be good reasons in particular cases for taking on some identity. For example, oppression is often begun to be fought by the oppressed joining together under a shared identity.
In general, people typically take on an identity — or keep one that they find themselves with (upbringing) — to feel that they belong in some group of people. But I don't think that sticking some big label on oneself is necessary for belonging. One can belong in the group of one's friends and family just by being one anothers' nearest and dearest, not through being fellow x-ists or y-arians. And being partial to one's nearest and dearest as such isn't in itself harmful, only mutually beneficial to those involved, and beneficial to others since a group of mutually supportive individuals reduces the demands those individuals might make against those outwith that group.
But there can be good reasons in particular cases for taking on some identity. For example, oppression is often begun to be fought by the oppressed joining together under a shared identity.
In general, people typically take on an identity — or keep one that they find themselves with (upbringing) — to feel that they belong in some group of people. But I don't think that sticking some big label on oneself is necessary for belonging. One can belong in the group of one's friends and family just by being one anothers' nearest and dearest, not through being fellow x-ists or y-arians. And being partial to one's nearest and dearest as such isn't in itself harmful, only mutually beneficial to those involved, and beneficial to others since a group of mutually supportive individuals reduces the demands those individuals might make against those outwith that group.