ADVANTAGES

OM was in use in Hindu/Brahminism long before the Buddha
The Buddha viewed Tantra and Mantra practices with disdain then.
The use of honorifics, his holiness, etc is cultural, pertaining more to dynastic practices in imperial China. So too praying for long life and venerating the Guru (happens in Hinduism as well).
Prostrations, again is very feudal.

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