what would be the reason to focus our efforts on a less-developed vessel of doing electoralisms
The foremost reason is that PSL does not center electoralism in the same way that the DSA does (as far as I know). Anytime I suggest joining the DSA though, it comes with a big asterisk that you need to jump into the Marxist caucus and advocate for the DSA to become something more useful (like the PSL). The biggest appeal that the DSA has is that there are people already there (given most of them are libs, but it's up to the Marxist caucuses to start selling their regional branches on another outlook, that's step 1).
The foremost reason is that PSL does not center electoralism in the same way that the DSA does (as far as I know). Anytime I suggest joining the DSA though, it comes with a big asterisk that you need to jump into the Marxist caucus and advocate for the DSA to become something more useful (like the PSL). The biggest appeal that the DSA has is that there are people already there (given most of them are libs, but it's up to the Marxist caucuses to start selling their regional branches on another outlook, that's step 1).