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If you asked me for a pronunciation of a word, I would give you both. And personally, I would probably use both depending on my surroundings. To the Greeks I will use Greek to win the Greeks. To the Greco-Bohairic camp, I will use GB to share in prayer with the GB's. To the Old-Bohairic cam, I will use OB to share in prayer with the OB's. No one pronunciation scheme is more authentic or more correct.
The universality or near-universality of linguistic evolution or shift appears to apply to all languages. Yet you insist it doesn't apply to Coptic and anyone who supports GB doesn't know what he is talking about.
By the way, Cephas has demonstrated a high degree of knowledge and caliber in everything he has discussed in the past.