From your MRI results, it doesn't appear you have any rotator cuff tears, which is a good thing. When the rotator cuff muscles are still in tact, you can have a regular shoulder replacement. This gives you the best functionality in your shoulder, although you probably would need to be cautious with very heavy items above your shoulders. Once the rotator cuff becomes significantly damaged, a reverse shoulder replacement is needed which does bring some lifetime restrictions regarding weight.
You mention this began as a work-related injury. Is it being covered under Workman's Comp? If so, in the state of New York you must see only doctors that are approved by Workman's Comp. If you have regular insurance or can pay the fee for an office consultation, I suggest you see a shoulder specialist at the Hospital for Special Surgery for a second opinion. Ask to find a surgeon who works with younger patients. This will at least give you a different set of eyes on your situation. It may not help you with the Workman's Comp coverage, but at least you would have the additional information to make your decisions.
While you can just plow on with bad shoulders, they won't get any better. And, especially with the type of work you do, you are risking further injury. The more damaged the shoulder is, the more difficult the surgery can be and the more likely the rotator cuff might tear.
Shoulder replacements have come a long way in the past few years and it's very likely that you would not need a revision. I know when I had my left shoulder replaced a couple of years ago, my surgeon knew I was frequently lifting heavy things and that I did lots of remodeling work around my home and garden. He purposely gave me a longer stem to ensure I could continue with everything I wanted to do and it has worked very well. Unlike you, I don't frequently lift heavy objects above my head, though. That is definitely something you want to discuss with any surgeon you consult with.
Good luck and please let us know how things go. We'll be here as a sounding board and to help in any way we can so you can make the best decision for you.