Thanks for using my idea for the back half of the show. I enjoyed your discussion of the Dozier memo. Kudos 50-plus years later to Dozier for trying to catch lightning in a bottle and figure out the blueprint for the show. Of course, as you guys said, he could not keep it going.
Don't get me wrong, some of what he said was silly. Fewer female baddies because The Duo cannot engage them in bash-pow fights?? As you said, they can cheer from the sidelines while Batman and Robin take on the henchmen.
Dozier was right about trying to keep the look and feel of the first two arcs. Of course, that wasn't sustainable, not merely because of the loss of the Semplian ideal but because the caliber and worldview of directors changed, especially by season 3 when Oscar Rudolph basically became the house director. I'm not saying he was a terrible director--he wasn't. But he was a sitcom director, and liked to get over-the-top reactions and sitcommy double-takes. Know this: Beginning with Mr. Pilot, Robert Butler, who directed the first two arcs and three of the first six, most of the season 1 helmers had experience directing dramatic shows.
In the spring of 1959, when Rod Serling was starting to put together The Twilight Zone, his people researched potential directors, and for comedies, they came up with four names. One was Oscar Rudolph. (This info is from Martin Grams' book, The Twilight Zone: Unlocking The Door To A Television Classic). Rudolph directed 30 of the last 52 episodes of Batman.
Granted, as you guys said in your season 2 wrapup (on Aug. 17, 2017!!!), once Dozier decided to mine his Rolodex for guest villains, the slide in quality was somewhat inevitable. I know it's pure speculation, but I wish, in an alternate universe, that Bookworm creator Rik Vollaerts could have been the script editor post-Semple rather than Charles Hoffman. Certainly Vollaerts had a better feel for fantasy/sci-fi than Hoffman. In the spring of 1968, he put his proverbial hat into the ring for Star Trek's season 3 script editor, per author Marc Cushman. Whether Vollaerts would've been interested in such a gig in May/June 1966 is unknown.
As for #7, the infamous 'sexy dame' note, I should point out that Joan Collins was made a Dame of the British Empire in 2015.

'I thought Siren was perfect for Joan.'--Stanley Ralph Ross, writer of 'The Wail of the Siren'
My hobbies include gazing at the Siren and doing her bidding, evil or otherwise.
'She had a devastating, hypnotic effect on all the men.'--A schoolmate describing Joan Collins at age 17