Then we disagree. I have nothing more to add other than that it can be a powerful exploit as I explained here.
This link is what I quoted and pointed out that it is not as powerful as a Sorcerer using a scroll and Quicken spell.
To accomplish this, comparing a Sorcerer to a Thief. The Thief uses more actions to pull it off every turn (2 for sorc vs 3 for Thief) has far fewer spell slots available, uses less resources and is far less effective on a multiclass optimized around this "exploit".
I think you won't talk about it because this "exploit" is rather weak compared to what a Sorcerer can do with scrolls and Quicken spell.