The second block should use the 2 part naming convention. It helps prevent schema accidents and helps a bit (at least it used to back in the day) with performance.

As for getting synonyms wrong, sure, I agree. It's certainly possible but, once established, synonyms usually don't change and you normally don't restore Dev to Prod to do promotions. As with all else, though, "It Depends". For us, such synonyms have been a life saver because of a sometimes silly but usually effective requirement to name databases with an "underscore environment" extension. This also allows us to have multiple nearly identical databases on Dev boxes so that multiple different tacks on development of large batch processing systems can simultaneously exist without necessarily creating a full environment (other utility, staging, and security databases) for each endeavor.