If they stop running on him it does not logically decrease his defensive value! It just might decrease his measurable defensive value if CS count is part of the equation. It's hard to measure "choosing not to run because the C has a cannon"
I dunno, hitters hit.
2020-2021 in the Venezuela winter league hit .373
2021 MiLB hit .367
2021 AFL hit .329
2022 MiLB hit .315
2022 MLB hit .319
2023 MLB is hitting .321
He might just be a guy who runs a .350 BABIP all the time because of batted ball profile. Not all ground balls are created equal. Some good hitters are able to go with pitches and spray their groundballs all around, leading to high batting averages.
If anything, arrow up on Moreno's offense because he is surviving without accessing any of the power or patience he showed a bit of in the minors. He had 9% walk rates at times down there. He had 8 HR in 32 games in 2021 in AA and 12 HR in 82 games in 2019. As he matures I could see him being more like, 20% above league average or better as a hitter. Maybe something like Alex Verdugo?