Evidently, the Prince of life does not think them sufficient.
There will no more communion as we know it today once the Lord returns for we do it partly to shew the Lord's death till he come(1Co.11:26).
Ships that sank in the ocean were probably solid in some areas but in others not so much.
Why do we not rather focus our attention on infallible Scripture? Especially knowing, as Paul forewarned the Ephesians, there would be a marked spiritual downgrade in just a short while. The earliest of the post-Parousia Church Fathers demonstrate this downgrade.
A) Our job is to believe the scriptures, even we don't understand them
B) We, the church, won't be partaking of any of that. It's the nations of the millennial kingdom that will be doing that.
We are a different body.
Look, I'm not just going to ignore a prophet of God that writes 8 exceedingly detailed chapters about a millennial temple and sacrifices, et al, + Paul's statement in Colossians about yet-to-come Jewish ordinances.
Now it's up to me to figure out how that fits, but not to spiritualize it into oblivion; see signature #1.
God has a way of throwing us all for a loop once we think we know it all.
In Isaiah's time, that event didn't happen, but in OUR time, it already has happened.
But in OUR time, the Parousia hasn't yet happened, and it won't, til after the antichrist & his sidekick the false prophet comes, & the great trib occurs.