Ask yourself this question: if you're not an FL main -- would you rather deal with the tightened timing windows rather than the visual obstruction?
Or a better question: Do you feel that you can score what would be 900k normally, on hard rock? If you can answer yes to this question, using FL is useless. With a multiplier of 1.2x, players who can get at least 916,668 points before the HR multiplier is added will mathematically beat out a player who is using FL, even if they get a SSS (1,000,000) score prior to the multiplier. Given the level of play we're likely to experience in MWC, a huge majority of players will almost certainly be picking HR because the risk to use it is incredibly low compared to the multiplier.
The strategy would be much more interesting if you could activate both at the same time, and if the multipliers were reduced.
Or a better question: Do you feel that you can score what would be 900k normally, on hard rock? If you can answer yes to this question, using FL is useless. With a multiplier of 1.2x, players who can get at least 916,668 points before the HR multiplier is added will mathematically beat out a player who is using FL, even if they get a SSS (1,000,000) score prior to the multiplier. Given the level of play we're likely to experience in MWC, a huge majority of players will almost certainly be picking HR because the risk to use it is incredibly low compared to the multiplier.
The strategy would be much more interesting if you could activate both at the same time, and if the multipliers were reduced.