The "oil squirters" you are reffering to are called lash adjusters. In the EJ22T they are solid. In all the other EJ22's they are not, AFAIK.
The solid lash adjuster is preferable for turbo applications. Reason being, at higher rev's the lash takes a H3ll of a beating from the spring assembly. However, these parts will wear quicker on account of the fact there is no more oil passing through the rocker assembly.
The oil serves to lubricate the contact surface of the lash adjuster. The rocker assembly benefits from the cool oil passing through the guts of the rocker and arms.
For N/A engines the regular lash adjuster is preferred b/c it's nearly impossible to generate that much re-bound in the springs to damage them.
Class is in session. Please have a seat and prepare your notes.
-Sambo