"And what’s the point of putting someone on a range anyway? Your hand doesn’t have the same equity against all hands in a range"
I will answer only on that, because I never used Upswing Lab.
In poker on higher level of thinking you play a range vs range. Not hand vs range or hands vs hand. It's important, because in poker you represent a range. Not a single hand.
The easiest example:
You open from a button 65s and regular player on Big Blind calls. Flop comes AK4r.
First think what range your oponent can have in this situation on this board. He has many medium Ax in his range, many medium Kx in his range, some gutshots like QJs, QTs, TJs, because not everyone 3bet them preflop, 4x there is only hands like A4, A4s (from time to time), 64s, 74s, K4s. Plus he has a lot of hands which missed a board, like Q8o, 98o, 96s etc etc.
You have 65s, but you don't open from BU only 65s but you open a lot of hands like every PP, every Ax (sometimes fold with A2o-A3o), every Kx, and many hands which didn't hit a board.
But what's the most important you need to answer yourself who has a range advantage on a board AK4s in spot BU vs BB. It's you, because you have in your range every set: You have AA, KK, 44. Your opponent can only have 44, because with aces and kings he would 3bet preflop. Also you have strong Ax on this board like AK, AQ, AJ etc. Your opponent doesn't have it, because he would 3bet it preflop.
So your range is much stronger than your opponent. What does it mean for you? it means that you have a huge fold equity on this board if you would barrel it, because your opponent on this board structure will never has an easy call vs 3 barrels.
So you don't focus on 65s, but you focus what you can represent. By betting flop, turn, river with your 65s which is actually an air you can win a pot, because your opponent doesn't have a strong range there. You have! of course we can't 3barrel there every time with every combination because people would start to call us very wide, but I just wanted to show you in some simple way how ranges work on some kind of structures and positions.
That's why you play a range vs range. Of course vs recreational players you don't focus so much on your range because your opponent doesn't think that way. That's why you focus more on exploits and actually your hand, but that's a different thing. Every spot in poker is different. But thinking in ranges, improving your hand reading is one of the most important stuff in poker if you want to be a decent player.