Again free things are always crippled and primitive.
If you want real FAX you will get FaxTalk Pro Center from
ThoughtCOmmunications.
They acquired's legendary WinFaxTalk Pro several years ago as it ceased to
work under Vista, and had issues even under WinXP.
Symantec refused to continue development and sold it.
Now FaxTalkPro is the new Delrina/WinFax.
If you want inferior, unsupported product which cuts corners, then of course
you will use WIndows built-in FAXing.
There's a reason for money, and that is to pay for goods, not for gimmicks
as most freebies are