Many mobile apps just exist to browse a certain web site (HN, Reddit, etc) at which point making a native app makes little sense if you're just copying the design of a site. This also extends to desktop (Spotify, Steam, etc). The problem with Electron (or CEF or QtWeb*) is that it's running an independent rendering engine adding a significant overhead. If you're already running a browser even complex web apps such as a WebGL sculpter[0] add a minimum usage on the session. Of course there's the problem of persistently running a web browser which may lead to high energy consumption.
Is this page resource usage on the browser or the total? Else, you used the browser's (about:performance in Firefox) or you system's task manager to get this figure? If the later, that is exactly what I meant with engine overhead. You should consider that initial figure shared among tabs/apps.
Strange. It shows only 1.7MB on FF 89.0 (Linux, x64). That's why I thought you're checking the total memory. Then again the total in there is far smaller than what the system usage is, so this manager is unreliable.
[0]: https://stephaneginier.com/sculptgl/