I've resisted the urge to repot this lacunosa because it had suffered from drying out completely during its shipment to me. But now it's been a month and it has slowly lost more than 1/3 of its leaves, and some of the thinner branches have rotted/wilted off at the soil line.
I'm thinking it does not like the way it was potted by the seller when it was prepared for me. The soil looks like regular potting soil with some perlite in it. The drainage is fine, but I'm suspecting its relatively baby 'cuttings' roots are not able to access enough oxygen in the soil.
Instead of watching it continue to dwindle, I'm going to carefully repot it while it still has some perky branches... into more of a hoya friendly soil with some orchid bark bits and a little more perlite. Then it will either die or start thriving.