The thing that you've done with shops: [current gold] - [cost] = [remaining gold]
Please can you do that with monster health on attack? And hero health? And XP too, ideally.
When the monster has 80 health, and I do 20 damage, I can pretty much figure out what the result will be. When the monster has 137 health, I do 23 damage, it has 35% phys resistance, but also has 2 layers of corrosion, and I'm using the flaming sword and it has 5 points of burning... it gets a little harder to work out what the actual final health will be.
The predictor thing works (but is hard to see in the new UI). But let's be honest - DD is not a game where you can ignore the numbers. DD is a game where to get beyond even a fairly basic level, you need to get a calculator out. That is not not a thing to be ashamed of. That is a thing to rejoice in. There are very few games like that. So please make it easy for us to do that.