I have a nuanced view of this (which I'll opine, knowing it takes your thread off-course....

)
Collateral valuation is always relevant to the transaction when part of the loan-equation is based on a loan-to-value calculation (and we are talking mortgage finance transactions).
Up to recently, appraisals (and by extension, appraisers) were the go-to source to obtain the collateral value.
Recently (and going forward), we are not the go-to source; alternatives are available and becoming more acceptable. And that acceptance of alternatives appears to be accelerating.
So there are acceptable alternatives for an appraisal in the valuation of the collateral.
I agree with how you worded your comment... "
In some cases... we are irrelevant to the transaction." If an acceptable alternative exists and it is deemed superior (for whatever reason; cost, speed, etc.) vs. what we provide, then the appraiser becomes irrelevant to
that transaction because an appraisal is not necessary to address the collateral value question for
that specific loan transaction; i.e., the "some cases" you reference.
The market is shifting. We can try to fight that shift or adapt to that shift (and, sometimes, the answer is to fight part of the shift and adapt to what remains). Not necessarily pleasant and sometimes scary, but it is what it is.
You and me both, brother! (or, sister, as the case may be!

)