The insistance on native feeling UI and shortcuts is something I only see from Mac users. I think the app would work perfectly well in Electron but would just attract the usual complaints from Mac users.
This shouldn't necessarily be interpreted as "Mac users are special flowers", but rather, "Mac users may have stronger opinions about this because they've experienced the benefits of native apps".
I've been around the block with operating systems, and was primarily a Linux user for many years. Later in my career, I started to appreciate the simplicity and consistency of the Apple ecosystem, and while I recognize that's not everyone's thing, it lets me focus on the job at hand and spend less time learning how to use new apps/tools. This is valuable.
Look at how *nix, Windows, Sun, BSD, Chrome OS (which is basically a linux anyways) all use Ctrl, Meta (alt), and Shift for their hotkeys, compared to how Mac uses Hyper (cmd).
Also look at how Mac has one instance of an app's tool bar/menu that all windows share.
I'll agree that the consistent UI is a boon, but there's a large lack of discoverability imo, and some things that are just entirely lacking, like the ability to move windows around with hotkeys.
It's more accurate to say that in modern UIs the others decided to each go their own different paths and replicate part of what made the MacOS experience special, but they also tended to forget to include a lot of the little details that made it great, and have never had the same dedication to consistency.
Re: discoverability, there's an order to discovering advanced options in MacOS - hold Option and click on menus. You'll be surprised how far that gets you. The whole idea of MacOS and native apps is you learn how to use the system once, and you're rewarded from thereon out. Not all things are discoverable without these keys because not all things are relevant for everyday uses and can add clutter - its a design choice to make simple things easy and hard things possible. They're not always perfect but they're still the best game in town.
RE: moving windows with hotkeys, just get an app like Magnet, problem solved.
If they're so attached to native apps, maybe they should build a website/community where people ready to pay more for native apps can say they want for example a native client for slack, discord, spotify, and then the companies can see if it's viable or not.
My problem is that these complaints are exactly like "the back button is broken", it doesn't bring anything new or interesting to talk about, people never propose to help a project or to pay money for new features, they just complain and never stop. This isn't good content for Hacker News in general.
BTW. there is a paid native slack client: https://shrugs.app