I think this is a discussion of marketing hype. It arguing / discussing brochures.
Snapon is flinging factoids to the un-educated. Snapon implies that they are the only company that know what they are doing and they have a staff of tool fairy metallurgist that carefully select steel at the peak of it's freshness to ensure a good tool. I think all the metalugist at other companies would disagree. What I do know is that the objective of tools is durability and strength for their anticipated use.
It is an extremely complicated process that starts with the alloy. It starts with the intended use and anticipated use environment. For example, I have a set of Makita 3/8 impact sockets for my impact driver. They are nice full chrome thin wall sockets. They will never see more than 120 f/lbs. I have other 3/8 that will see 500 f/lbs. There are a million micro tweaks of the alloy along with contaminants from the mining or refining process, Then the manufacturing process, whether it is forged, drawn stamped or rolled. Then there are all the variations on tempering and annealing. At the end, will a tool manufactured by Company A outlast one made by Company B?
I think I get the gist of what you are saying. This is why I do not consider Snap-On the best and end all for tools, I consider them top of the line tools. Some people believe that, and they are welcome to. I don't think it is all marketing hype though, but to a degree, yes. I say that because there is fact that supports the overall superiority of Snap-On tools. I see it as if the words are true and the results are better than others, then it is not just hype but fact that shows why they are better.
I 100% agree with your last statement "At the end, will a tool manufactured by Company A outlast one made by Company B?", but I would also add to it, both tools otherwise being equal in form, fit, function, etc. That statement also depends on the user and how how the tools is used.... also warranty, in the intended use, can you afford to get it replaced under warranty or will that time without the tool be problematic? That is at least how I relate that good statement to a buying decision.
I relate that info to the specific tool. Tools like pullers tend to have issues lasting the test of time. For those, quality matters to me, assuming it is a tool I plan to use again. So take a product like a ball joint press. You can get a cheap HF one, and while I have never used one, I hear from many they bend, stretch, the forcing screw strips, etc. Other companies state they resist this. So when they talk about the differences in their product, this means something to me.
1. My product will not bend, it is better.
2. My product will not bend, we use this and that, heat threat this and that way, etc.
One of those is easier to believe as the statement is justified. Hype, sure, but if it is true, hype becomes fact. It is then up to the person to determine if that creates value. I relate the Snap-On material provided to be more like #2 above, which is why it matters to me. Every brand uses premium, quality, superior, etc steel, but say nothing to justify it. Most just after all that state CrV steel. That is like #1, statements that say a lot and show nothing. Every brand on the store shelf uses CrV steel and they all use the "best"... yet they are all likely using the same steel and the same processes.
Regarding hype, I agree though that Snap-On is a lot of hype. If I swap tools with a professional with all Snap-On tools, is that going to make by work suddenly better and theirs suddenly worse? It might make the professional's job a bit harder for them, but the person does the work, not the tools. I see a lot of hype with people on YouTube, the people that boat about having a Snap-On toolbox filled with all Snap-On tools. Then, they show the tools they do not have and need to borrow from coworkers, which happen to be NOT Snap-On.