bnddir *SRVPGM *IMMED vs *DEFER

Why would anyone want to use *IMMED over *DEFER?

We currently have most of our SRVPGMS in our binding directory defined with
*IMMED but running into issues when the *SRVPGM is not in the library
list. Upon pgm initialization, if the *SRVPGM's cannot be found in the
libl, the pgm blows up. But if we set it to *DEFER we would have an
opportunity on the first call to ADDLIBLE.

I know there are other ways to handle this, such as just specifying the
library in the binding directory along with the *SRVPGM but we don't want
to do that.

Anyone see any issues with doing a mass *IMMED change to *DEFER and
recompiling our pgms? So that we may include this small step to ADDLIBLE
on first pgm call?

tia

Jay