Naw, they are taking it away.
This is not true, and I donât know where people keep getting this from. In the current ITOS and KTOS, HP/SP regen is locked to a timer. The timer is 20 seconds standing and 10 seconds sitting. You can, like most pros, sit down every 10 secs to recover SP when fighting. There are only a hand-full of skills that take away this regen during use (even those I am not sure, as I havenât used those skills).
Edit: certain skills can also shorten this timer. Squire food, Summoner cat, Diev statue, Krivis fire, etc.
This is true only generally. There are classes that would not need CON, as they themselves have the natural ability to survive. This also goes for Sp regen, etc. For instance my Chaplain/PD, he is naturally tanky, deals good damage, and never has to worry about Sp because he is a SPR based, auto attacking machine, with natural attributes that increase regen as well.
Another example is my Shinobi. I built him to use skills that work with shadow clones and some few off handed skills (I often come out #1 in DPS). This leaves me with enough downtime to regen sp or worry about other things. Of course in a grinding situation hes gonna be poop.