You used an interesting view of "practical" :) Deep connection is not just some bonus, I think, but in fact the main practical thing about a relationship.
So I share your concern, but even so I'm not that worried. The deeper a connection you've been able to forge in the past, the better your chances of forging another deep connection.
If having had a deep connection happened because you are in general someone easily capable of deep connection, it would be indeed easier to connect deeply again.
But if having a deep connection happened despite you not being such a person, but, e.g., because the person you lost had an equally rare disposition as you, or you lived through special circumstances that bonded you more deeply, it's probably harder to replicate this.
So I share your concern, but even so I'm not that worried. The deeper a connection you've been able to forge in the past, the better your chances of forging another deep connection.