I think a lot of people would, but you're likely to receive a response that states such a useful tool just trivializes encounters.
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Like we need more raging when a party wipes. "OMG why haven't you been practicing this boss over and over, noob"
I think this game already has too much easy mode
If it's just you solo you're still not learning the fight and here's why: You still have to deal with 7 other people who may or may not know the fight and will maybe make mistakes. People could die before the heart, tanks could drop from Mountain Buster because of bad healers or not rotating cooldowns, or people will drop from tumults because of low HP. If you practice the actual boss with a full party, if they're all in good attitude then you can talk over mistakes, correct them and maybe eventually win, which is something a practice room can't give.
A practice room won't help me with T5 during Divebomb/snake stages because I have to rely on my 7 other teammates getting to the same point alive and DPSing the right targets and dodging Divebombs. A solo practice room can't simulate the AI that is the human brain behind the computer
I think you're missing my point, or over-thinking it because the things you mentioned would have no impact on what I am imagining. Here's why: people could die before the heart (this is true, and when we do get past the heart I'll be ready because I've been practicing for it). Tanks could drop from Mountain Buster (this is true, but when we get to the bombs I'll be ready because I've been practicing for it). I described it as a training room to practice avoiding a boss's abilities, not learn how to tank or heal. Perhaps other training rooms could be designed for those.
Think of it like this: You're on a baseball team. You have practice with your team to prepare for an actual game against another team so that you're conditioned for it. But outside of that, it's wise to practice without your team, things such as catching and hitting, running the bases, etc. You don't need your team for that. At most, you need one other person. It may not prepare you 100% for the main event in its entirety, but at least you will be more conditioned for certain aspects of it.
This is a good idea, but honestly. If more people would simply learn Titan's rotation, the fight wouldn't be so hard for people. Plumes, the number one killer of pugs, always comes after specific moves. If you start moving a little after the precursor move happens, then you'll never be hit by a plume. As far as bombs go, there are only three patterns. Learn each and you'll know exactly how to move to never be hit by them.
There is a practice room, it is called Duty Finder.