I think this is great. True native Linux-first power user browsers are nearly an entirely unserved niche. We've had them on macOS in various forms over the years (with OmniWeb being the original), but for a long time the only browsers built to integrate well with Linux desktops were minimal and light on features (like the WebKit version of GNOME Web/Epiphany).

It probably matters less to Linux users who do the minimal tiling WM thing, but as someone more drawn to traditional floating DEs it's always bothered me how alien the browsers one might actually want to use feel running in a GTK or Qt DE. Themes can help reduce the gap, but it never disappears — that last 10-20% always remains as an unavoidable side effect of how the big browsers are built, with it being particularly pronounced with Firefox and derivatives.

Of course a GTK based browser like Orion isn't going to feel the best under a Qt desktop like KDE, but GTK themed to match Plasma is a good deal closer than the bespoke UI found in e.g. Firefox or Chrome.