***What specific blessings are we missing out on?***
In baptism, being able to look back and seeing God’s promise being fulfilled in your life.
In the Supper, spiritual union with Christ.
So yes, there is grace in the Sacraments. Not salvic grace but grace upon grace, grace.
How does a baby a couple months old look back on their life? I can see how an adult who has been quickened by the Lord, has come to Faith and realizes how lost they are without Jesus Christ as their Lord and Saviour can look back and see God's promise being fulfilled.
In the Supper, spiritual union with Christ.
We have Christ in us and where two or three are gathered in his name he is with us.
So yes, there is grace in the Sacraments.
Why not join the RCC then. How is what you're saying any different than what they say?