FI and CRI are two distinct ratings are they both have very specific applications.
CRI is by no means a short cut to the FI as it may appear. There are some instances in some specialised fields, where the CRI may only be the only viable option.
It you take mountain flying or aerobatics, the aim is to rate pilots with extensive experience gained over decades in these fields to be able to teach and convey their experience, without going through the long and laborious theoretical or ATPL or CPL , for which in their fields they have no real need.
But they need a level of understanding, techniques and standardisation in how to teach, They don't need to learn their job but rather how to teach it..