After posting I did go back and test some more just to be on the safe side and honestly for me the difference is tremendous like my game is unplayable when open hit detection is bad and I die instantly. I have another theory as to why it could be. When you look at the way open moderate and strict can connect you see open can connect to all, moderate can do moderate and open. and strict to open.
So by having an open nat wouldn't that be increasing your chance to lobby up with people on strict nat types and that's why it feels like the hit reg is off. I know we are connecting to servers so I don't know if it works that way but again surely having a strict nat and trying to kill that person will slow down the process or even kick out packets of data you send to them making it feel like bad hit reg.
For the chance and for that one reason I think this is why we are having a better experience on moderate. I'd probably also say most upnps are not working correctly to open up the ports I've seen loads of people on moderate and its not because they set it like that but its more because thats how the router came and they are not tech savvy to open the nat. Also if they have 2 consoles xbox takes 3074 and then there ps4/5 can't get that for warzone server and stuck on moderate as port 3074 is taken.
As for mtu I'm still playing around with this, there's so much info out there to say no just leave it as it is it won't make a difference. But surely it does surely if I'm on 1500mtu and an xbox player is capped to 1480 fragmentation needs to happen in order for my packets to be processed and received? Whether that's on the peers end or the servers end as zippy says if servers are not running at 1500mtu but I'm sending packets of 1500 the server would also have to fragment packets or simply kick them out and that's where my bullets are going?
I can say that changing my mtu from router and manually setting it up on the playstation seems to be worse. I'm using 1472 as most that aren't on 1500 would be on 1472 going by the 28mtu header thing.
Keeping my router on 1500 and dropping my ps5 to 1472 seems to work better like the xbox being capped at 1480mtu there must be reason to that or for that and that tells me everyone is playing on different mtu values. Making it really hard to fully test and come up with a perfect this or that works but I will say 1472 has me going into gun fights sometimes feeling like I'm the sponge and he's a magnet to my bullets it feels great. (So many times I've gone to the gulag hit a guy with my shotgun chest to head and get a hit marker then he shoots back one shot to my kneecaps and takes me out). I had this in reverse yesterday playing on 1472mtu its not conclusive and it is testing but from now on my nat stays moderate p.s. I tried to force strict on my router by opening ports to a random ip that wasn't my ps so the ports where in use but it didn't work lol if you can force strict it would be interesting to see the outcome let me know. Sorry its a long one lol