Bruh that’s the longest post I’ve ever seen lel. I’ll try to put my response in the same order.
Burnout’s can be a bit of both and I think they are always present together with maybe one contributing more than the other. Tbh I can’t empathise with psychological burnout because I love lifting for the sake of it. The sensations, the pain, the whole journey and experience I enjoy it all from thr beginning and still do. I can see how one could potentially tho. Maybe growing disillusioned with the sport or their progress. Maybe that drive to push 100% 24/7 is too much. Getting super hyped and pushing yourself to the max every workout is unsustainable which is why many programs incorporate light days and the like.
Physical burnout can be stuff like doing as much volume as possible to get the maximum amount/ rate of adaptions. Faster results sure but beats up your body. I’m guessing the dude who goes more minimum effective volume will end up in a better place with good steady adaptions over years e.g. the Russians.
I’m not really thinking at all about a serious injury which could be caused by any number of things or just plain bad luck.
I think most importantly you need to know your own body. It comes with experience. How much you can take and how that feels.
E.g. For myself in my accumulation phase around about 22-24 working sets per week for chest is my MRV. I could make fast gains training close to this say 20 sets but that’s going “hardcore” for me at least. Mentally and physically that’d be unsustainable. What I do is wave up and down over a mesocycle. Week 1 14 sets, W2 16, W3 18 W5 20-22 and W6 deload. While the rate of gains is less than 22 22 22 22 etc. this method is more sustainable and I’m confident in being able to, if I chose, to do this for years. Building, building, building. Always building.
Tbh gear both contributes to and prevents burnout. Gear will increase your work capacity and recovery ability. You abuse this and go ham you’ll do harm to your long term sustainability, potential and ultimately results.
Use gear right and you’ll be able to enhance performance beyond your natural limits and end up with a better result faster.
In an interview Konstantin Konstantinov spoke of this and how many lifters rely on the drugs.