As you highlight, asking everyone to set up their own cross-posting solution is probably not viable. But if there was some service run by the LW team that had a simple guide for setting it up (e.g. go to your LW account, get your Twitter API key, copy it here, grant permission, done.) and it took ~5 minutes, that would lower the barrier to entry a lot and would be a huge step forward.
As you highlight, asking everyone to set up their own cross-posting solution is probably not viable. But if there was some service run by the LW team that had a simple guide for setting it up (e.g. go to your LW account, get your Twitter API key, copy it here, grant permission, done.) and it took ~5 minutes, that would lower the barrier to entry a lot and would be a huge step forward.