Some of the objections couched in legal terms are nonsense of fanciful. One woman on the news was saying that the bill was flawed because a gay couple could not divorce for adultery and not have the marriage declared a nullity for non-consummation. (She didn't explain whether she meant wilful non-consummation or incapacity of consummation)
The first objection is met by pleading unreasonable behaviour, which is what is pleaded if a wife takes up with another woman. Pleas of nullity have persisted to modern times, but have been an anachronism. Wilful refusal to consummate is simply a way, the obvious way with heterosexuals, of saying that one party refused to accept they were married, and treated the marriage as void from the start. Any such declaration, by word or deed, could be treated as a contractual matter, but common sense suggests that it be treated as unreasonable behaviour