Yeah, using Testing directly is a bad idea. Instead pick a distro based on Testing - like LMDE (Linux Mint Debian Edition); or if you really need bleeding edge use Sid instead, but be aware that it was named after the child who breaks toys for a reason.
I think that it’s partially due to Debian’s focus on stability. If they call it “stable” it’s rock solid; if they call it “unstable” it’s still fairly usable, it’s just the 0.1% odds that it’ll evoke Cthulhu in the process.
In my Sid times I managed to break it, but to be fair it was more like a Frankendebian at that point.