A small Optimus Primal that had a properly painted face and didn't turn into a giant slab.
The draw of the figure was Optimal Optimus

To me the Optimus Primal figure gave the figure a surfboard as an homage to TM Primal, and he's a pretty ok "Cybertronian" mode Primal. I donno. I don't get the hate.
We ended up with a proper update of Optimus Primal for Kingdom anyway.
Being able to turn into all four of Optimal Optimus's original modes would have been nice, since being a quad-changer was Optimal Optimus's whole thing.
To me the importance of the Optimal Optimus form isn't that he's a quad changer, it's that it's Primal's form when his spark is merged with a Prime's. Which, incidentally, made it the perfect form to focus on for a PotP figure meant to depict Primal as a Prime.
Oh, and having a torso stable enough to not come apart at the slightest action while actually playing with the toy would have also been nice.
Maybe I got lucky with tolerances but mine is pretty solid.
And I know I'm being picky with this one, but... the chest cockpit being the correct color of orange would have looked so much better (the gray cockpit really only looks good for the Throne of the Primes redeco version).
It's in the eye of the beholder. So it's all good. Personally the cockpit colour isn't anywhere near a deal breaker.
Look.
None of these complaints are invalid. They just don't bother
me.
My take on it? Optimus Primal takes in the spark of a Prime that looks a lot like the Matrix and becomes Optimal Optimus so it made all the sense in the world to focus a toy on the Optimal design for him as "the next Prime."
So when it wasn't what people expected it's just like... this was the obvious direction. Like... maybe a smaller Primal in gorilla form that wears a bigger gorilla that is the Optimal body as armour... maybe?
I'm just fine with what we got though.
The whole Primal vote just seemed steeped in fandom negativity though so...