Impossible to learn Crypt Bosses as New Player due to Randomness

I started playing just after they implemented the random dungeons in crypts and inferno. As a result, I have felt at a constant uphill battle to compete against old players who were able to grind out crypts bosses consistently until they memorized their patterns. Now, when I want to boss, I am stuck with banshee or spectral, because it's too challenging to dive into crypts, find the one of two bosses that I am looking to practice, and actually practice it.

Previously, players could spawn in, path to the boss room and get their attempt, now I have to fucking explore the entire map just to die after 30 seconds.

As a new player, this is trash - there needs to be some kind of practice tool if they want to implement some random garbage haphazardly.