I read the entire thread, and I just wanted to ease your fears a little bit on direct Riviera. We have 300 direct Riviera points and it's still our favorite, bought in 2019 before it was open. We have a September use year because we thought we'd be going in the fall and early December with ease. We HAVE gone early December, and it's far and away our favorite time of year to go, but kids' schedules now prevent it until they graduate high school, and probably college! So another decade of now going February and/or April vacation -- or now Thanksgiving week. All peak weeks.
Just to reassure you, we love Riviera more and more. Each kid will get a direct contract with benefits, boy/girl Irish twins. I had FOMO for PIT and we bought 100 direct points this fall. I don't regret it, per se, because I like the tower and we don't do studios as a family. BTDT, it sucks for us. We like laundry, full kitchen, and privacy with a king bed and separate bedroom.
I would do a test run at Poly before buying. I'm glad we only have 100 points. It's enough to bank/borrow for a special trip every blue moon or to do a split stay for a holiday party trip, but the chaos over there is just no bueno for us. That also goes for Grand Floridian, too, although Poly amenities were crazed with families with little kids all over the place, whereas Grand Floridian is a huge attraction in itself, especially around the holidays/gingerbread house stuff, and we HATED the crowds and chaos.
Hubby and I just did a weekend President's weekend at PIT, and while the tower is awesome and the rooms are really perfected, the constant crowds and packed pools and hot tubs 24/7 was a turnoff. I feel like a major hypocrite, complaining about kids at a Disney resort, LOL, but I get peopled out being in the parks and really crave the quiet resort experience when I come back "home," so weaving between kids throwing a ball in the walkways and taking up all the hot tub space after a long day hoofing it in the park -- woof.
We, ironically, really dislike the theming/lack of theming at BLT, but I think we may try it post refurbishment and may like it since it's quiet and doesn't have a themed lobby to draw a crowd.
I think 150x2 direct at Riviera makes sense, and we don't regret it. 300 is perfect for a 1B peak weeks with enough left over to do a random weekend or go baller and stay longer, or else book a room on the previous night if you do a late flight and don't want to be homeless.