Because some people google search ,,S30V any good“ then they read post from some random user that says S35VN, M390 is WAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAY better and then they thought that S30V is junk.
I think what we, knife people, often forget, that like 80% of all pocket knives in the world are made from stainless with 0,3 C HTed to like 52 HRC.
S30V is a good to go steel. And I still think that many knife users could not tell a difference between S30V (these days utter junk along with mystery pot steel), S35VN (these days godlike steel) and like M390 (HT to 58 HRC :p ).
As usual, take my post and all S30V with a grain of SaltTM and if you like the specific model, buy it no matter the steel.