I would expand this to say that it matters how many people in the household. For one person, 55 Mbps is fine for streaming video and 350 GB is fine for downloads, unless you’re d/l multiple AAA games. 350 GB might also cause trouble if you do significant cloud backups.
If you’re in a household of 4 people, that 350 GB is likely to bite, and 55 Mbps is likely to struggle if you’re all watching something different.
Encrypt email with anyone who publishes a key. If “bad” emails are the only ones you encrypt, then that metadata can be used to raise suspicion of you and to trace your contacts.