I don't understand the logic of that.
Either you need faster speeds or you don't.
If 80/20 isn't enough then surely ordering 160/30 would be a considerable improvement.
Double the downstream and 50% increase in upstream.
Don't buy a package for bragging rights. Buy what you need.
The fact 80/20 is fast enough for you is a good enough reason not to order a 2nd line at a faster speed at considerable extra cost.
Also, you don't have to comment on your G.Fast estimates on every single G.Fast thread created by someone else.
You could allow the thread to focus on the OP once in a while.