Fair question, though it assumes citizenships are simple things you “use,” which you either need or don’t. They’re not. People attach all sorts of baggage, duties, and rights to them. Mine are a mix of ancestry, residence, and ones I helped my spouse with. They’re not things I “need,” they’re just where my family and life have been. European family trees often produce this. The original point still stands: even when you’re entitled to a citizenship, actually obtaining the documents takes real time and money.