The old exclusives were added when - frankly - everyone had thought core development had stopped and 505/Engine wanted to add more to endgame.
Then "something about a new update" happened and the rest is history. Along that road, these additions simply made less and less sense as the actual core game filled in all around and beyond these.
They won't be on PC because they don't fit the vision for the core game and never did. So, if we are to embark on this One Terraria journey, this bandaid had to be ripped off sooner or later.
As for Ocram's visuals, I'll just post what I did back on TO when he was first released for old times sake:
View attachment 183197
I get that it sucks to lose stuff you once had, but these didn't really add much to the game and most stood out like a sore thumb vs the core design.