As an outsider I see how you can think that way, but alas Falkon is not a 'new' browser.
It's the ol' faithful Qupzilla, but rebranded to fall into the KDE umbrella. But as other KDE browsers (konqueror, rekonq...) it's dying a slow death only to fall in darkness.
Oh, that is too bad. After hearing this, I decided to do a little searching around to see if I could find an open-source browser that is more active. I found Nyxt.
Nyxt is web engine agnostic. We utilize a minimal API to interface to any web engine. This makes us flexible and resilient to changes in the web landscape. Currently, we support WebKit and WebEngine (Blink).
So in theory, you could switch between web engines. I don't know if you can do that on demand or not. It does seem like a cool project, so I will likely try it out.