>I'd really like a rejection physical letter back saying thankyou for application but no thanks signed by a human

If you want personalized human rejection letters to come back to you, then the hiring process would have to be equally friction based: i.e. mailing in notarized copies of documents and interviewing in person, for it to scale and not overwhelm a company's resources.

>I put some effort in to applying

Yeah but so did hundreds of other people. This worked in the world of 20+ years ago, but it doesn't scale anymore in the era of online applications where every job posting gets hundreds of applications within a week.

It doesn't matter if you put in more work in your application than the other 200 candidates who are doing "spray and pray", it's too much noise for humans to swift through with without some automated screening that might just as well drop you through the net because it can't tell the amount of work you put in, you're just a number in a queue.