Purgatory, as we all know, is a Late Medieval invention that was taught in a certain way for about 500 years. Lately, it's been reconsidered by the Roman Catholic Church. So we have the original teaching that supposedly was infallible because the Magisterium agreed upon it--a sort of temporary Hell that everyone who is saved will pass through to "pay" for all minor sins and, also, mortal sins already forgiven--and we also have the revised but unofficial one which is a vaguely defined transitional period or state that's more like an orientation session prior to one's entrance into Heaven. It's been described as the "Celestial Showerbath" (or washroom) by some.
The problem (if that's what it should be called) is that all discussions of this sort founder on the fact that there are two views of Purgatory--the standard one and the whitewashed version that's recently only been created because there aren't many Catholics any longer who will believe in the standard and historic Purgatory.
I think, in addition, that the standard definition may be seen by the church as inhibiting its efforts at outreach, ecumenical relationships, and "come home" campaigns. This probably is enough in itself to justify ditching Purgatory like Limbo was ditched before.