Making the abilities class specific isn't removing them from the game, it just gives the different classes a specialty instead of having every class be able to abuse the advantageous TP to damage ratio of abilities like Haymaker. They actually are removing Haymaker (or at least converting it into a regular WS if it is one of the unnamed combo elements in the PGL list) but Jarring Strike will remain and I suspect it'll probably receive a bit of a damage buff in the process.

All melee classes will retain a reactionary skill, they just won't all be blended as one so you'll actually need to be aware of which class you are on when reacting instead of "hey the mob missed, time to punch with my (axe|spear|sword|hth)" across the board. This also opens the door for greater specialization in gear per class for maximizing opportunities for one specific event per class.

Voicing potential concerns about how things will be balanced is legitimate but going off and making wild leaps ahead when we are missing tons of variables is something else entirely. All we have is basic descriptions with really no idea about skill potency, additional effect proc rates, recasts, traits, all of which are at the absolute core of combat balance and hugely important for both soloing and party play. Feedback on general concepts can be helpful but wild speculation is just useless filler and reduces the chances of any constructive ideas being discussed and having an impact.