Falkon relies on Qt for QtWebEngine, not Plasma. Which has its maintenance issues of its own (look it up, it's a chore nobody really likes doing and is therefore infrequent, something you don't want for a web engine).
Falkon, on many platforms, links Qt statically, so you stil rely on them making timely releases.
It is absolutely not a browser anybody should use.
GNOME Web has next to no UI over WebKit, so the claim is easily verified.
GNOME web is truly bad. Not only is it WebKit based (which puts it at a stark disadvantage out of the gate), but it also lacks tons of features like extention support, settings sync, custom themes, robust developer tooling, PWA support, the list goes on...
Hell, GNOME web hasn't even fixed it's text rendering issues yet. Text is still jagged and aliased out-of-the box. It's definitely on the cusp of "unusably bad"
Falkon, on many platforms, links Qt statically, so you stil rely on them making timely releases.
It is absolutely not a browser anybody should use.
GNOME Web has next to no UI over WebKit, so the claim is easily verified.