I'm "extraplocombing" (extrapolating and combining) the answers from your referenced question regarding Shacharit with Mishnah Brura 232:2. See Sha'arei Tzion #4, who points out that since Ma'ariv is reshut (not obligatory) we are not as concerned about the requirement of smichat g'ulah litfilah (loose translation - connecting the concept of redemption as said in the blessing "G'al Yisra'el, to tefillah, meaning Shmoneh Esreh).
Thus, in Shacharit, one should not answer "Amein" to the Bracha "Ga'al Yisra'el" said by the chazzan. Therefore, the custom in many places for the chazzan to say the ending of the bracha silently to prevent people from answering "Amein".
In Ma'ariv, if we are not as strict about the semicha, there is more flexibility for the chazzan to say the "Amen of Kaddish aloud, and people can answer "Amein" as well. The mechaber mentions that one can even include "Barchu" (I haven't seen this done, anywhere) prior to the start of Shmoneh Esreh in Ma'ariv.
Re - Mincha - there is no "Ge'ulah" in Mincha, so the concerns of semicha don't apply, and the Chazan should say "Amein" aloud and everyone can answer with no problems.