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I'd argue that deploying from one codebase to 3+ different platforms is new functionality, although not for the end user per se.
I wish though that more of the web apps would come as no batteries included (by default or at least as a selectable option), i.e. use whatever webview is available on the system instead of shipping another one regardless of if you want it or not.
But if your tool chain is worth anything the size of each binary shouldn't be bigger. To oversimplify things a bit: it's just #ifdefs and a proper tool chain.
In the web development world on the other hand everything was always awful. Every nodejs package has half the world as dependencies...
Because the app stores keep adding new requirements that you have to add code to deal with and it gets worse every year and seemingly every day.
There's lots of valid reasons for this.
Imo the biggest one people don't account for is this: Dev salaries are incredibly high. if you want fast performance the most optimal way would be to target the platform and use low level native code, so C++ or Swift.
It would cost you like 20x more than just using electron and it will cost you bigly if you have multiple platforms to maintain.
So it turns out having 1 team crunching out an app on electron with hundreds of dependencies is cheaper, naturally that's what most companies will do.
Don't want to use electron ? Then it's kind of the same issue except this time you're using Java and C# and you have to handle platform specific things on your own (think audio libraries for example). It's definitely doable but will be more costly than using a cross platform chromium app.
Remember that day when GDPR dropped and website suddenly started loading much faster.
Performance/optimisation wise is an environmental catastrophe..