God wants humans to meet him halfway
Well, no doubt God uses natural agencies to carry out His will all the time. We just don’t call those “miracles”, except in a very informal sense.
Say a homeless guy is on the street asking for money. I might give him some, because God told me to help the poor. Now, I would be doing God’s will, but that isn’t a miracle. If money just appeared in the homeless guy’s cup without any natural source, that would be a miracle. Calling everyday fortunate events “miracles” just cheapens the word.