OK...Here it is....You asked for it!
The tractor/mowers I use in the commercial end are mostly pull type bat wings. However, I do have a couple smaller mounted mowers we use essentially as "giant weed eaters" in confined areas. They have hydraulic top links, and what i like to refer to as "toggle links" (flexible top link mounting points) Their configuration allows great flexibility. Mow where we mow and you really need that.....Getting down into ditches, around culverts, and in some VERY awkward spots, I've seem mowers 45 degrees up or down from level with the tractor. No, I don't want that on a regular basis, but it happens...
Now, on to what I use "at home". My property is partially level hay fields, and a good bit of hilly, choppy, steep creek banks, woods, and roadside ditches. By this point in my life, I've had all the fun I want with using weed eaters and such. I mow EVERY blade of grass/weeds I can with a mounted rotary cutter. Most people would have a panic attack watching me mow. I've put tractors into positions where the faint of heart wouldn't dare. To achieve that end, I've ran without a top link at all on occasion. I've used chain top links, and I've replaced sections of the rear struts (from rear of mower deck to top link mast structure) with chain to allow the top link "A Frame" to fold back when needed. About 50% of the mowing I do on my place (other than the hay fields) requires me to adjust the mower to where the tail wheel is still on the ground when the 3-point hitch is all the way raised.
For the record, when using NO top link OR when using a chain as a top link, I've NEVER seen the mower "kick up" when the leading edge hit an obstacle. That "theory" is just that....a theory.....One that just doesn't seem to exist in real world FACT. Anything is "possible", but I'm not changing my way of doing things based on a theory that is seemingly unheard of in real life.
The single greatest "safety device" that can be installed on a tractor is a SAFE, EXPERIENCED, REASONABLE OPERATOR. Without such, NO device added or left off will prevent accidents. WITH such, most would truly be amazed at what you can do with a tractor and mower.....
And yes, I'm basing my opinion of tens of thousands of hours of real world application.....not just a few hours in the seat and a theory.