Deleting a param from a view through the property editor will no longer orphan its propConfig in the view json. This prevents the deleted param from showing up in the param suggestions menu within the property config (for example, when using an Embedded view component). Previously orphaned propConfigs will remain, however they may be cleaned up manually either through editing the view json or by adding the param back and then deleting it once again.
I just verified this exact behavior (albeit in 8.1.14 - but I believe this behavior to be unchanged from 8.1.12).