All of the guided "ask X to introduce you to Y" systems that I have seen are... poorly implemented. The thing is, asking for an intro is complex; it depends on your relationship with the person doing the introduction, and with their relationship with the end target, and with how beneficial the potential relationship between the introduced parties is perceived to be.
You have a limited number of "waste your more important contact's time" tokens. You get more when you successfully introduce someone who is useful to your higher-status contact,
The odd thing is, even in an unsuccessful match, where you introduce two people and they don't establish a relationship they both find pleasant, if you connect a lower-status contact with the higher-status contact, even if the match is unsuccessful, you are still seen to have done your lower-status contact a favor, even though you have annoyed the higher status contact, so if the lower-status contact is someone you want to curry favor with, it might make sense to introduce them even if there is a lower probability of them forming a mutually profitable relationship with the higher-status contact, but normally it's a matter of "how interesting is the potential relationship between the two people I am introducing," which takes some thought and often times means not making the introduction.
The upshot here is that I'm not going to just right out introduce two of my contacts. I mean, I will if I think they can have a beneficial relationship, but I generally feel pretty weird when someone directly asks me for an intro to another specific person, rather than 'Hey, do you know anyone who is good with X" - because with the latter, I can talk to each person individually, and I can silently drop the whole thing without telling the other they were rejected, whereas if X asks me to introduce them to Y, and either Y says they are not interested or I think I would annoy Y, then I've gotta reject X, which can be awkward.