Accoding to the actions list, the only evasion based ability that isn't getting axed is Jarring Strike, ie PGL WS 9. There isn't another evasion counter WS so no Haymaker at all, can't be class exclusive if it no longer exists. If the name/animation are reused at all, it'll be as one of the many standard weaponskills so whether you are tanking or not is not an issue.
Simian Thrash, assuming the name and animation are reused, is being converted into a normal WS without an evasion requirement that is even part of a combo, PGL WS 3. The text mentions low damage and it being toned down a little was to be expected with the requirement being removed, it could still have pretty decent potential. Either way, PGL will retain 1 evasion counter (the weakest, utility one) so complaining about the evasion requirements at this point is a waste of time.
Where there is legitimate cause for concern is in the the balance between the following elements: base damage (unbuffed), effectiveness of the damage boost from kicks/elemental modes, rate of MP consumption of those modes and effectiveness of the MP recovery tools. Balancing these elements properly would be a challenge for anyone but given the current, very poor compensation offered by Featherfoot for the MP costs of Light Strike and Pummel, being worried about potential issues is natural especially since cross-class MP abilities don't seem likely to be as effective as Siphon MP.
If base damage over time is close to comparable with other classes, then the buffs can't be too strong without breaking balance unless the MP cost is extremely high. If base damage is significantly lower and doing acceptable damage requires having the buffs active the majority of the time, the cost needs to be balanced so that this can be achieved. You also have to take into account the presence or lack of a bard to give refresh, whether the refresh (MP) song will stack with the regain (TP) and accuracy songs, how practical separating songs will be if you can't just stack them all, etc.
All in all a fairly complex balancing act and expecting the devs to get it right the first time is highly unrealistic, but expecting them to get it horribly wrong and let it remain horribly wrong forever after is also ridiculous. While certain things about SE haven't changed quite as much as they'd like us to believe, denying the change in their attitude when it comes to addressing glaring balance issues is just ridiculous, if anything at this point they've been overcompensating. They realize the game will fail if they don't achieve interesting and balanced results, it might take a few steps to get there but they are actually willing to take those steps as problems come up instead of the early XI attitude of pretending there was nothing wrong for years and then nerfing or buffing certain elements with the delicate subtlety of a jackhammer without even acknowledging that there was a problem at all.