Help understanding what is necessary, helpful and maybe even hurtful in terms of a 4K Disc Player for a Sony A90J OLED

I own a pair of Sony A90J sets (one 55", one 65") and have recently dove head first into the world of 4K Blu Ray Discs. Having spent what I've spent on the TV's and the now 30 some odd movies on 4K physical media.... I've decided I might as well invest in a player that does more for the setup than my PS5 does.

But it's confusing as to what's needed, helpful or otherwise maybe even hurtful in terms of the experience and features on the TV vs features of the 4K player.

My primary candidates are the Panasonic UB820 and UB450.

As I understand it, both support HDR/HDR10 and Dolby Vision. The upscaling tech in the 450 is said to be inferior to that of the 820. And I've read even further (mixed results) about how the A90J itself upscales better than what the UB820 does. I'm not sure what is true there. That's no "so much" of a big deal for me though.

Today I bought a UB820 on amazon. I'm not sure if I want to keep it though (it hasn't even arrived yet). I did this because it supports HDR Optimization. A feature that, depending on what's true, could really benefit the A90J as I understand it. The A90J's average (so not peak?) HDR brightness isn't quite at 1000 nits. Anything over that gets clipped. A big deal? Could be I guess. I've also read a lot of the popular release groups don't master their 4K movie disks with anything higher in HDR brightness than 1000 nits.

I've read where people say to let the TV do the tone mapping and shut it off the HDR optimizer on the player. I've read where people say to leave both on. And of course, the other combo as well.... turn tone mapping off on the A90J and use the HDR Optimizer on the UB820.

I guess to boil this all down to an actual question:

Does the A90J actually need / make good use of the HDR Optimizer in the Panasonic UB820?
If so, do you run it with or without the tone mapping setting enabled on the A90J?

Do you think there is actually enough of a use case for it, or is this a very small minority type thing? I've read where the HDR Optimizer only works on HDR10 content, and that most physical disks use DV anyhow?

Just trying to wrap my mind around this. If HDR Optimizer isn't a huge need / doesn't offer all that much... I can return the UB820 and buy a UB450 for like $170 instead of the $365 I paid for the 820.