Because normal mystcraft portals are useful for something OTHER than exploding things remotely. They are the single most useful method of medium-or-larger distance transport I've yet encountered. They're nearly completely configurable as to locations, they can work intra-dimension as well as inter-dimension... They fix every single problem I've ever had with a transport system, and they don't require power (Yeah, sorry. Getting me to my friends base isn't something I think should drain my main power net, nor should it require maintenance, or drain stuff when I'm not using it... which is why I don't use Enhanced Portals).
The only issue is there's no blacklist/whitelist for entities that are allowed to travel through a portal. That's literally it.