The default is as long as it is because most people value not losing data, or avoiding corruption, or generally preserving the proper functioning of software on their machine, over 90 seconds during which they could simply walk away.
Especially when those 90 seconds only even come up when something isn't right.
If you feel that strongly that you'd rather let something malfunction, then you're entirely at liberty to change the configuration. You don't have to accept the design decisions of the package maintainers if you really want to do something differently.
Also, if you're that set against investigating why your system isn't behaving the way you expect, then what the hell are you doing running arch? Half the point of that distro is that you get the bleeding edge of everything, and you're expected to maintain your own damn system