The press release is just amazing. :) See, there is nothing wrong with the WFCO. It is your fault if the batteries need Bulk, and besides at 13.6 it can recharge a flat battery in 3 hours.
The IQ4 gizmo is what makes the DLS do 14.6ish instead of just 14.2 as with the dual jack device. The IQ4 does not give you any control, it is automatic. IMO the PD and Charge Wizard is better in that the CW gives you control to force Bulk as needed.
I disagree that the Iota 30 amper would be as fast as the PD 45 amper doing a 50-90. The CW keeps it at 14.4 for four hours while the IQ4 drops to 14.2 15 minutes after the battery gets to 14.6 and you can't make it go back to 14.6 by just hitting a button again.
Much depends also on the charging rate (charging amps vs battery bank size in AH) just what SOC you get to when the battery reaches 14.6 and how much more the battery needs in generator time.
If you want to do a 50-90 and it gets to 14.6 at 75, the 75-90 part will take longer at 14.2 then it would at 14.4. If you were doing 50-80s instead, then the 75-80 part isn't such a big deal. You might even get to 80 before it hits 14.6 with a low charging rate.
It is all about generator time. You can calculate pretty close how it would go with different charging rates and charging profiles of the various Brands on your battery bank to see which is faster, and if enough gen time is saved to make it worth picking one over the other.