Sony 4K UHD Player. They didn't make a ton of models, and I don't feel the need to specify right now.
I have watched discs on my PS5 and Xbox One X, and even watched a few on PS4 Pro years and years ago.
My non-Gaming PC (never had a Gaming PC) has a DVD drive, but I've never used DVDs on it yet. Just burned a couple CDs.

PS3 - You put the disk in and click play. Easy.

I remember trying to watch a BluRay on a PS4 once, but it wanted me to download something, and/or sign up for some crap first, so I switched the PS4 off and booted up the PS3 instead.

That said, I haven't watched a BluRay movie for years.

I been using a dedicated sony since 2021 (UBPX800M2). I have no complaint with the quality as long as you have it set correctly. It has one VERY annoying downside through as it don't auto detect dolby vision so I have to keep a list of all my blu-rays of which one support dolby vision and which one dont so that I can manually set dolby vision on or off as needed. I got a really good price on it back in 2021 (black friday sale $180) so I got my money worth out of it despite that one annoyance.

I'm still using a Laser multi regional player we've had since like 2010; still works really well. 

I tried using various consoles as a player over the years and found the results weren't as good as a dedicated machine, to my eyes anyway.