Good points made! Yeah, at the very least, I think it's safe to expect the combat to receive an overhaul for the better, even if we're navigating the world at a similar pace to the first three games. This is probably an off the wall idea, but I'm wondering if there's any possibility for some kind of cool beam sword emanating from her arm cannon, as a close range option. I'm expecting new suits, new weapons, new tools to play around with.
Regarding Samus as a slow moving tank, versus an agile superhero, of sorts, I'd say Super was sort of the turning point. First appearance of the Wall Jump and Speed Booster / Shinespark, which would go on to become staples, in subsequent games. I'm not skilled enough to do it, but the high level movement that speed runners employ in Super is pretty amazing to witness. I do believe the depiction / notion of Samus as a clunky tank is a somewhat dated one, at this point.