People made some good points already, but I'd like to add a few of my personal observations:
F2 not necessarily filling your endurance bar for a predictable amount, depending on the grand master used, makes it feel really awkward
F2 not flipping your skills as fast as a legend-swap feels off and unintuitive
F2 doing two different things means I've never used it for both effects: only either skill-swap or endurance gain
F2 doesn't interact with the other legends and doesn't stand as much on its own than the renegade skills
Icons look very different
The alliance skills are not terribly impactful for their cooldown
I rarely have the skills I need on hand because of the flip-over mechanic
There is no hard CC on any of the skills
There are no combos on the greatsword
There are no upkeep skills 😪
Overall it's still fairly fun, but it doesn't feel like I'm playing a revenant: the energy management is minimal since there are no upkeep skills and the skill effects (outside of Greatsword 5) don't have that revenant flair.
