Aside from using throwing weapons, the new system is mostly the same as the current system.

TP gain is based on delay, once delays line up the same classes will have the same TP over a given time. Variance comes in with missing, use of throwing weapons and TP skills. All this system does is change it from gain per hit to gain over time, takes out the penalty for missing too.

Learn to manage your TP and you'll be fine. Just like when mages finally had to actually start conserving MP, we'll learn to use the system well.