I mean honestly even though I don't care for it, if most people loved it then I would cheerfully redesign Pleco around it; the problem is that they released a design that way too many people hate and that is likely not long for this world, and it would be a terrible shame to waste a lot of time optimizing around that.
For me, it would be wonderful if a macOS desktop edition could surface by the time macOS 28 arrives. macOS 27 will reportedly be a sort of "housekeeping" release, since Intel support ends with macOS 26 (Tahoe). One thing that will be removed in macOS 28 is full Rosetta 2 support [see
here], which means Wenlin is going to stop working for me around January 2028 (when I update to MacOS 28) -- unless Tom Bishop or someone else can be persuaded to update the app, which was last updated in 2016.
Currently I connect my iPad to my Mac and just use Universal Clipboard to directly copy-paste long, complex citations from Hanyu Da Cidian into Wenlin on my desktop, where I can trace them and parse them more easily. I haven't felt a strong need for you to use Catalyst to port the iOS/iPadOS version to macOS or even to have a desktop version, but if Wenlin goes away then a desktop version of Pleco could be useful.
I think I must have posted here in the past, but I've had to re-register today. I've had Pleco since 2011, but I'm not sure I've ever expressed just how useful Pleco has been, due to the quality of the dictionaries you've provided. I lugged the original print edition of Hanyu Da Cidian back with me on a plane in the 1990s, and I had the CD version, but the 12 volumes (and the CD) did not go up into the attic until Pleco got it. Thank you.
As I'm sure you know, there is a revised and expanded 2024 edition, available
here -- it would be nice to have offline access to the 2024 edition, but I don't know if that's possible.