Yes, that’s exactly it. The trade-off is better performance for 99.999% of users, with saves for both network usage and user battery, but people who disable JS on their modern smarthphones don’t get the static HTML version.
Force a redirect with a meta tag? Maybe we render a button on the else of this if here
that reloads the current page with a parameter and/or setting a cookie?
Considering the impact here, and the work needed, I’d say it’s low priority work and pr-welcome.