Recently, there have been increasing calls for specialization in ijtihad (Islamic jurisprudential reasoning),…

Answer

In the name of Allah, First, it should be understood that anyone who has engaged in true ijtihad knows that specialization in Islamic jurisprudence is not reasonable according to scholarly standards. Second, if specialization is assumed, then the jurist who specializes in one area of fiqh would be ignorant and a muqallid (follower) in the remaining areas. The evidences that permit taqlid (emulation) do not apply to him, and in fact, the permissibility of a fragmented jurist (al-faqih al-mutajazzi’) acting upon his own fatwa is a matter of scholarly debate. Allah knows best.