We're keeping our '16 6 seater, so no point getting another 6 seater. Kids complaining about lack of arm rest on 6-seater middle seats. Like you, we hardly use the 3rd row seats anymore, now that kids are grown. When they were younger, they enjoy being all the way in the back.
I wanted the fold-flat feature to store extra stuff when dropping kids off @ college. 6-seater was harder to manage storage and load bigger items.
Road-trips are mostly wife & I, so we don't care about the AC issues for the back. Although with the 5-seater, it feels more claustrophobic. Just because I think the it's missing that center seat in the 6-seater, it feels more open.
-ThinkMac-