im sure theres some technical reason behind it
i cant really say cause im not an expert on this
also im stealing this quote from reddit
"If software is used to disable the home button, then software can be used to re-enable it and allow for security compromises to take place."
Then they should actually say what the technical reason behind it is, instead of saying nothing at all. I'm not going to believe that they have a legitimate reason unless they give me evidence there is one. I don't trust companies unless they've earned my trust, and Apple most certainly has not with their extremely shady, lazy and frankly stupid business practices.
And your explanation falls apart considering that the person who posted that doesn't even know how the error 53 check works. You'd need, as you said, expert info to be able to conclude why it's like that.