If they didn't ask for something like a receipt, then people could go to the dump, curb, etc pull something out of the trash and then try to get a replacement.
Far as getting parts, and service. Yes, I think everyone wishes all companies made it easy for anyone to get a hold of them and buy a part. Even if it's a bit pricey for what it is, if it means being able too keep something going, great.
People hate trashing things, but at the same time most stuff made today is designed to be trashed, even if you could get the part, is it worth it? Making tools easy to repair and get parts for makes sense when they are well designed tools designed to be around for a long time.
Some companies do a good job, others a famously horrible. The nice thing about stuff festool makes is there is little reason for change, things can go on for a long time as is. Which is why when the make a dumb change, or leave out a feature that should have been there, it's extra frustrating as it probably won't get resolved for 10-15 years.
It's what makes well built, well designed corded tools nice. There is no reason they won't work just fine for decades and be serviceable along the way. For items you use rarely, maybe even pull out once every few years, they can't be beat.