It is my understanding the goal of a patent is to defend on many levels. Getting the pattent with general claims in it is not that big of a deal, much of it may fall away in litigation. So for my pattent, the lawyer described a 3-tier defence. So if we lose on the general high-level, we defend on more detailed points, if we lose on them we try to hang on to the very minute details that seperate us from other patents.
So the large claims are wishfull thinking, the real value in the patent is in those minor details.
The patent offices let all kinda of crazy stuff through, but don't let it scare you, mostly that is the purpose and it would not hold up to litigation. For example, someone could patent all kinda of stuff, but 3 years later, I make a functional prototype, my claim can overturn theirs. There are many complexities...
Here is another resource (I have not used it much, but it is legit in a world of scammers)
I am no expert, I have only been through it once, but that amounted to 5 years of meetings with lawyers...
Vaughn