I hear this excuse a lot, but there isn't a single benefit I've talked about which is for the developer only.

Install times are a big one. No user wants to install thing and manage dependencies or manually install updates. The sandboxing is another very pro-user thing as it makes sure my fuckups or mistakes can't easily cause their whole PC to be compromised, and they don't need to spend time making sure they have permissions setup correctly for my application on every device.

And for me, as a user, I greatly prefer web apps because I and many other people live a multi device life. If I have an Android phone, a Windows work PC, and a personal MacBook, I need to learn 3 different UIs for a single application. I need to configure them 3 times, manage their settings in 3 places. With a web app I learn 1 UI, I configure it once, I can login on my main PC or my father's Linux laptop and get the same app I'm used to in seconds.

No worrying about making backups for it, no worrying about the permissions I'm giving it, no worrying about the updates each machine is on, or how much space it might be taking up, or if it's using HTTP connections for updates, or that support for my older OS might get dropped, or that it won't hit my new distro for 6 months, or that it's not available in my package manager, or that it will autostart at boot and be an annoyance, or that uninstalling it will leave a bunch of shit behind, or any other of the things that native applications do that annoy me.

I go to a URL, and I use an app in less than a second on any device I own. And if I want, I can quickly go into the browser settings and wipe that app and everything it's touched from the PC in seconds.

That might be optimising for my wanted experience as a user, but I can't please everyone and I see a lot more multi-device multi-OS users who don't want to manage all the details of a native app than I ever do of users that want the opposite.