I think the consensus is that it is pretty bad but I think what is more contestable about the combo ban is - other than preferring to not create such a complicated ban - is that there one very obvious abuser out there. Froslass is a cut above other abusers of Snow Cloak which makes it difficult IMO to really assess the situation. Stats speak for themselves when you only Lass and Swine make UU for snow cloak users.
Sure you'd hate to miss on Mamoswine, but as already mentioned earlier he's just plain good on every other aspect (making him quite UU and from stats OU worthy if the trend continues) so of course you'd want him dead, but again like other slower Snow Cloak users its an obvious gamble for them to hope for a Snow Cloak miss compared to Froslass who has a much better chance - and can even supplement that with TW and create a disadvantageous situation for the entire opposing team with spike support (in addition to being the spike blocker) and inadvertently yes paralysis support should it opt for that so as to increase likelihood of not hitting other Snow Cloak users. So I really find it hard to say whether that ban would be more appropriate given how she hogs the spotlight well in that regard.
I actually couldn't tell you whether I would prefer to miss against Froslass, Mamoswine, or Glaceon. Missing against Froslass usually means it get spikes up, yeah, but missing against Glaceon or Mamoswine usually means your check to those Pokemon will die, which opens your team up to a full sweep. This is especially the case if you rely on offensive checks instead of hard counters (like...every offensive team). Which of the snow cloak abusers is most dangerous really just depends on your team. People just focus on froslass more because she's way more common.