[Someone1234]

It simply isn't for high data usage no matter how you slice it.

You're calculating the prices based on hitting the data ceiling on Fi every month, if you are hitting the ceiling that often then you shouldn't be on Fi. T-Mobile's family offering is likely better value for true unlimited.

In general I agree Fi isn't great for families, because kids often consume a ton of data. It might be good for a spouses if both parties don't use much data.