Generally, riding boots will be taller, and stiffer. Some will have steel or molded plastic 'braces' inside the leather. Not as comfortable to walk in but they offer a lot of ankle support in a get-off. Obviously, every one is different. Some are glorified work boots that they just tagged extra money onto and called it "motorcycle", or just regular boots with thicker soles.
Mine I love, they are zip-up (the real advantage to those is no laces to leak; absolutely bone dry in all kinds of weather; even torrential downpours). Very stiff leather. Less comfortable for walking around, but super comfy on the bike. The ankle support adds a level of comfort. In theory, it'll offer more support in a wreck. But for all we know your boots could've been the difference between a sprained ankle or a serious long-recovery tear!
Also, I'm positive you already know this; but it's time for a new lid. They are 'one time use'. Make sure your insurance adjuster knows about any damaged helmet/riding gear/etc. Most policies cover it (sometimes under 'accessory' coverage). There's an internal liner that actually does the work in a crash, and it's done it's job; and it's toast.
SOME helmet manufacturers even take back wrecked helmets (usually with a police report) and will replace them for free. They do R&D work on helmets that have been uh... "used"! And use the data to improve designs.
I do not think you are crazy. I completely understand you. Well designed lid is very comfortable, light, well ventilated, quiet and does not abstract field of view. There is nothing wrong with that. I am all pro choice of riding gear. (even if it is 0) gear. But it should be dictated by personal risk assessment, not by cultural cliche, the type of bike one rides or government.
No. He did not say anything about boots. But speaking from personal experience a well designed proper riding boot that does not allow foot to bend on yaw axis, only on pitch axis for walking made a lot of difference for me. Of course if one would hit a brick wall at 70mph one would be dead no matter what gear.
For sure. And properly fitting. Lots of folks try a full face on once, one brand, or get one off of craigslist, or one came with the bike; and it's uncomfortable because it's cheap junk or just doesn't fit well.