Its value is only in a very narrow useage, and it is often misused.
When you have large enough sample sizes, not very often, and they are somewhat balanced, comparing two catchers on the same team- pitcher by pitcher, I feel those numbers have meaning and significance. Several sample sizes between Leon & Vaz have 250+ PAs with each catcher. When almost all of them show a wide disparity, and with a couple it's around or over 1.50, it matters, to me.
Comparing Wong and McGuire's tint samples of differing pitchers is misuse of the stat.