No, the *biggest* disservice is to argue in terms of red herrings. Purgatory is NOT, and never has been, a "way to heaven" independent of the death of Christ. Everyone in purgatory has been saved by the death of Christ ALREADY, or they never get there.
There’s no need for purgatory for the saved.
If they are saved, then there is no longer any sin to be forgiven for.
When the body of flesh dies, the old nature is gone and all that is left is the new, perfect, pure nature.
There’s NOTHING to be cleansed from because the blood of Jesus took care of that.
If the blood of Jesus didn’t cleanse us from all our sin, then there’s sin left to our account and the soul goes to hell, IOW, is NOT saved from God’s just judgment against sin.