I have owned several different brands and styles of cutters over the years.
Had a bushhog brand model 105 that was a swinging a-frame and chain. No worries about bending straps, but yes, there is a slightly greater risk of backflip in certain cases. But it was a good cutter and followed the ground well.
I also had a KK 5' standard TSC mower. It had the 2" straps. They were bent as being discussed here. IT didnt have a swinging toplink. I converted it to chain style like the BH 105
My bushhog 306 is also rigid. When you cross uneven terrain, it dont mow well. But is built heavy. The whole 3PH will raise when crossing a dip instead of bending the straps. Because the straps are heavy. And made so they dont bend. 2x2x1/4" angle iron IIRC.
My new mower, is allowed to float. Allthough not at a clevis/swinging toplink hanger, but not a chain either. Woods DS96. It does have one of the straps bent, but that was due to careless chaining point when loading it, not from mowing.
Dad also has a international IM600 mower. Similar to My KK5'...but his is a 6'. It had the cheap flimsy straps but it also has the clevis swinging toplink. Allthough it dont have much travel and the straps were bent. I replaced them with angle iron like on my 306.
My thoughts are.....I dont care what "style" the mower has. If it is built right, you wont mess anything up. Cheap cutters with rigid connections and flimsy 2" x 3/16" straps.....thats not built right. If you are gonna build a rigid cutter.....those pieces need to be angle iron. Because the straps cannot handle compression....only tension.
A simple fix for the cheap straps on a rigid cutter......hydraulic toplink with a float valve:thumbsup: