I only took note of this recently as well (perhaps this should be moved to the public test forum?).
I didn’t realise when I was first glossing over changes but the conversion moving from the medal to the chest hurts the Elemental Horn of Gandarr character I put together some time ago.
Most options to replace the conversion mean a significant loss elsewhere whether it’s breaking the full Rimetongue set or losing conversion for example if I swap out the Spelldrinker for Empyrion’s Mercy and see whether it’s still worth keeping Attak Seru or not - which was the main starting point I had for the character to begin with.
Without making any adjustments for the playtest to account for the loss, in-game damage loss is about 8k sheet DPS on Horn of Gandarr going from 100% conversion to 70% (45% Fire + 25% Cold via stat re-rolls) and an unknown amount of damage loss on Grenado. Twin Fangs, Seal of Blades/Whirling Blades, the twin Fire Lance ring procs and a couple of flat Pierce damage sources like Arcane Empowerment are the only other places where the conversion will have mattered.
In practice, it still feels relatively fine to play while clearing crowds and Heroes, though maybe a little slow at some points but still fine. It can still meet my goals on endgame kills like Lokarr though it feels noticeably harder and takes about 10-20% longer now. Whether that’s enough of a difference to warrant the change being reverted or not I don’t know 
. Personally, it still does irk me ever so slightly though - call it OCD over having perfect conversions before and no longer having that feeling and the ultimatum of being forced to accept losses, try to make changes while minimising losses (if this is even possible) or worst case - just scrapping the build completely and starting over to see if I can recreate something with a similar playstyle but stronger.