No way, Sir.
Check out Google Play Store ratings for the Lyngdorf Remote app. It has an average raging of 2,7 stars because it's flaky and shaky and won't connect all the time. Can't see any issue with my WiFi setup (I do know a bit about this stuff). It is perfectly good for all other apps on all other devices. This explicitly includes remote apps e.g. for Onkyo and Yamaha devices, both official and 3rd party. They all work flawlessly.
Can't speak for the iOS or iPadOS version of the app.
The built-in device web page is a totally different object. It works extremely fast and reliably. It also features perfect responsive design, so using it on a phone is just as pleasing as on a tablet, laptop or big screen PC.
Amen.