The week day Shmoneh Esrei prayer has a series of requests during which we ask Hashem for many of our needs. In my siddur (Tefilla Hashalem) there is a subtle change made in the texts of 1 of the brachot, adding in a word not found in my Artscroll.
In the prayer for the righteous (al hatzadikkim) my siddur reads "יהמו נא רחמיך" while the Artscroll omits the "na."
In the siddur Shiloh, that "na" is present as is one in the prayer for redemption (re'ei), "ראה נא בענינו" which is missing from both my siddur and the Artscroll.
I understand that the texts are sometimes variable, though I'm used to seeing shifts only in v'lamalshinim, but my question is not about these local changes. I am wondering, why is the presence of "please" so infrequent? Is there something special about these blessings that would mandate saying please? Isn't that something that should be in our every request? Should we say please when we ask for healing or intelligence or the arrival of a Moshiach?