You missed my point.Portent is three rolls for one specific type of wizard that are as likely to be low as high. Inspiration is a once in a while thing that applies advantage to one roll. Lucky also applies to three rerolls. So lets look at how it would play out.
Portent:
so one low, one middle high and one high number.
Combine that with 3 re-rolls and one inspiration and an 8 strength and you're probably missing every hard check of 20 as it's unlikely the wizard has chosen athletics with his 8 strength. Maaaaaaybe he succeeds once. That hardly allows the wizard to "reliably be the juggernaut" and the 8 int PC isn't even a conjurer, so he doesn't even have that to help him be Einstein.
The more rolls you give, the less "reliable" these PCs get.
This whole rule change is due to people not reading the rules.
Are you confident that they will read the part to restrict rolls?
Are you confident they won't forget because of fun?