We know that Jesus can do all of that and more just by being who he is to and for us and through out our life. We understand His all sufficiency because we've been tested and tried to learn how to simply trust....to rest and abide in Him.
I think some catholics use all these other things to steady themselves sort of...just in case it doesn't go as they hoped for....they can either point the finger at someone else for misleading them if things go bad...or hold onto something when they are uncertain....and in some cases because the leadership teaches them to do so.
It’s part of the flesh to fear to trust, but who better to trust than the God of the universe who loved us and gave Himself for us.
Course, if you have the twisted view of God that the Catholic church puts forth, that He’s the OT God of judgment, ready to zap you for the least little infraction, you’re going to have a harder time doing that.