Most "apps" today are browsers disguised as native applications running a pile of web 2.0 crap locally. A dead giveaway is the sheer amount of disk, memory and CPU they require.
An example of this most people are familiar with is Teams, which is nothing more than a glorified IRC client but requires gigabytes of disk and RAM.
But it's not limited to sloppy, hateful companies like Microsoft: FreeTube too is an Electron app, and while it is a favorite among open-source enthusiasts and Google haters, it is also a resource hog.
The point being, if it runs in a hidden browser you can't control, you can be certain it does everything it would do in YOUR browser if you didn't install NoScript and uBlock Origin, and configure it for security and privacy. In other words, if the app maker is adversarial like Microsoft, it's almost certainly spyware, and you're indeed better off running the app off their website with your regular browser instead.
Not to mention, if your browser is already open and burning tons of RAM by itself, why open a second one?