Don't worry, it's no biggy to not have a crafted relic on your bridle, mounted combat is so ridiculously easy/boring it'll not impact your lack of fun.
The only other liability is you can't make your own "best" crafted relic for your other legendaries either. This will have greater impact, but won't be devastating either.
Finally, you certainly will be able to get a FA or other hunter legendary, as they are not bound, you need not craft your own, anyone else can make them.
The amount of non-fun/non-game time it requires to deal with crafting isn't entirely worth it...most people who involve themselves in crafting actually don't, they go AFK while the crafting is occurring and do something more fun, like wash dishes or clean their basements or watch TV or etc.
Don't sweat it, don't worry about the lack. Investing countless hours in crafting to reduce a few mounted combat fights by seconds is not a good return on the investment, and yes, the "game" is designed that way.
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