You're late to the party.
Cool! Didn't dig in details of CMPCT_BLOCK.
It does nothing about the fact that months after your proposal activates, when I restart my node
The idea was to temporarily bypass the rule. So when you restart your node, it will accept all new blocks without checking them for spam.
Do you realize how long you would have to wait in order for the wallet to actually become usable?
Also node can simply bypass this rule for some time at start. Also we can add a new type of message for the purpose of mempool synchronization between the nodes.
Even if they do attempt to relay a transaction, a node that already has a transaction isn't going to re-relay a transaction
I don't propose miners to re-relay a transaction. They just have to relay it once or at least "assume that a transaction has already been propagated". Anyway, transactions always propagated before miners include them into the block (according to my proposal)