What do Blade Runner and Star Wars have in common, and what not?
In common: sci-fi
Not: style of the music
Hence, it's worth asking for specific details in order to make a choice.
But anyway, as you've more confidence in the exact seamless availability of stock music, go ahead.
That's not why I want to go with stock music. I want to go with stock music because I can't afford to pay a musician $200 a song to write three different songs because the first two didn't fit well. With stock music I can listen to samples for free and pick the one which works AND it costs half as much as custom music.
I may ultimately have to pay someone to write music, but it would be foolish not to look at the less expensive option first. Just because it's stock doesn't mean there's no chance of it fitting my game. There's lots of great stock music on
http://www.beatsuite.com/ for example.
Of course if you need more than one or two tunes in your game, then you might have a problem. For this game though, I only need a couple songs, as long as whatever songs I pick are fairly long, quiet, and not too repetitive.
Anyway you're not going to convince me to have you write music for me by giving me a snarky attitude over it. I know custom music can be better. But my decisions are driven by my financial reality. If I was well funded I could afford to pay people to screw up a few times. But I'm not.