It's not Electron, but it does use a fair bit of web views, or at least did in the past (there might have been talks of some of it being moved back to native code). Either way, it feels like an Electron app, and not even a good one. It's a piece of shit.
Why would someone be forced into changing their entire operating system to get an update to an app?
I just checked since I own multiple macs. It's true, they're going away from webviews, but their new native app ui is broken! When you go Browse, click the first big image and then press the back button in the top left corner, the white navigation bar space at the top disappears, causing the content below it to visibly jump up.
>Why would someone be forced into changing their entire operating system to get an update to an app?
...probably some APIs used that don't work on older OS's, and/or why bother supporting old Macs when the old app still works fine? I don't think it's a big deal.