Correct. The sending part simply involves Alice deriving a pubkey for Bob, a cryptographic operation with minimal elements. However, detecting silent payments requires scanning the blockchain to identify payments made to you, which means you need a Bitcoin node. The challenge is implementing this receiving functionality in a light wallet like Wasabi while preserving privacy. Fortunately, this is possible using block filters—a technology Wasabi implemented even before BIP158 was finalized. In other words: yes, the receiving part requires more work.