I've got about 2/3 of the plastic off so far, with a long vertical cut down the roots on one side

I'm going to soak it again tomorrow and whatever I can't remove from the bottom, I'll just assume won't do any harm in the new media. I'm sure it'll suffer some setback but won't suffer indefinitely....I think....I hope...I'll find out.
What are people supposed to do when they receive plants so root bound like this one? There was no room for new growth to occur within the pot, it would have grown beyond the rim and as it was, it was unstable and needed additional support just to sit in a pot, erect. Should I have left it alone and just put it in a larger pot to hold it up without disturbing it?....not that I would have

but I'm interested to know if anyone would have left it alone.