I can see the argument for someone with disabilities for pain. But for a normal person, how much of a problem can the weight on the Pro be? I have the iPhone 14 Pro Max, and I'm a rather small and skinny person that doesn't go to the GYM with fewer muscles than I should ideally have, especially in my arms and upper body. Still I can't say that I have any difficulties with the weight of the phone. I use it plenty while laying on the couch or while laying in bed and it's not a problem. The overall weight makes it feel more premium compared to when I was using the iPhone 8 Plus which was noticeable lighter if my memory serves me right. I'm not using it caseless, currently, I have the Apple Leather Case while I wait for my Bullstrap Leather case to arrive.
With that being said, I don't really see much value in polished stainless steel on the phone. When using the phone outside the case the steel becomes a fingerprint magnet and stainless steel is so easy to scratch. I had one generation of Apple Watch in stainless steel and I preferred the added heft/weight, but the stainless steel looked terrible very quickly. Luckily you can "fix" the problem by polishing the steel. But it will get scratched shortly after so I ended up polishing it for resell value more than anything else. I much prefer the finish of the aluminium and titanium watches, but the low weight makes them feel less premium.
I would prefer aluminium over polished stainless steel if I was going commando with my phone as that stainless steel would end up looking pretty bad very quickly. But Apple has made it impossible to enjoy the phone without a case due to the camera bump. It becomes annoying using the phone without the case when it's not remotely close to being capable of laying flat on the table.