I think there are nuance differences in the AWS systems on different models.
I ran a 425 AWS for 20+ years. Never an issue with the linkage. Extremely reliable; just keep the u-joints greased. Though it did reduce ground clearance. On that tractor, to use chains (which I did for all 20 years), you have to have wheel spacers installe.
When I moved up to my X739 AWS, I ordered spacers for it. However, I quickly found out that you cannot use the spacers with a 54" deck, meaning you would have to remove them to put the deck on. The tires would hit the gauge wheels. So I returned the spacers because I had no plans nor needs for chains and wasn't about to pull the wheels off twice a year to install/remove. Also on the x739, the AWS linkage is above the axle. So it doesn't affect ground clearance. I've been using the X for 6 years. No issues with the AWS. I think, because they offer spacers, that they are needed for chains, at least on the X7xxs. I would check with the dealer.
The other issue with chains and AWS is that they must be tight or there is risk of getting them caught up in the mechanisms. As I said I ran chains for 20+ years on a AWS without a problem, but I did put bungies on them and twist-wired them on every year. That is actually the only reason I moved up to the X739. I got tired of putting chains on every year. And the 4WD with HDAPS and some suitcase weights will go through just about any snow without an issue.
AWS is great plowing snow too. You can steer with the backs when the front tires get light. You can actually push snow sideways pretty nicely too. As you can tell, I'm a big fan of AWS.