The late Harry Fishbein used to bid 3NT with hands that
contained a four-card major but included a strong doubleton.

He said that too many times Stayman will land you in the
wrong contract, because so much of your strength is in your
short suit.

On this layout, 4 goes down, but 3NT is easy. There are no
guarantees, and it could backfire if you don't use Stayman, but
according to Harry, this was a good bidding idea.