I agree, except that it should be conversation (uncountable).
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iasadih"Many of our conversations were done over the phone"It does.
sounded English.
iasadihShould such a statement be remodeled toNo.
"Much of our conversation was done over the phone"
iasadih"Many of our conversations were done over the phone. The topics of these converasations varied."Yes.
is okay
iasadihbut outside such a specific context conversation is by default a mass, yes?No. Topic(s) of conversation is a set phrase, not referring to any specific conversation, unlike topics of these