California's CCPA laws are already in effect for "show me my data" and "delete my data" requests, but there are other US states planning to rollout in near future as well. You may think it doesn't apply for your business, but you could be mistaken, and all it takes is a stroke of a pen and a vote in state senate to expand the scope of these laws.
The last two companies I've worked for, one of my projects was developing a MPI (master person index) data mart. I recommend every company dedicate resources into implementing something like this, so that external audit or consumer data requests can be facilitated efficiently.
As for the "delete my data" requests - building out that process is another can of worms, especially for an enterprise with a lot of databases. At the very least, have your IT department start crowd sourcing an enterprise data dictionary and assign an owner to keep it maintained, so you at least know where all your PII data sources are and the contents.
"Do not seek to follow in the footsteps of the wise. Instead, seek what they sought." - Matsuo Basho