Considering she was replaced by the Kyuubi, I'm sure she won't be feeling salty. Anybody else, sure? But the strongest of the Tailed Beasts, with the most to gain by being the container of? There's no question about it.
I don't know anybody that wouldn't want the various chakra cloaks that come with completely mastering Kurama's power. I, personally, would look at someone sideways if they had Kurama and decided to go the summoning route. But that's just me.
And, with the rules stating that a bond is possible through being a Summoner, why would it be so far-fetched that a mental link is "eating one's cake"? How else would you develop the much needed bond between summoner and beast? Sure, I could have Mati be a little miffed, but to express and mend the relationship, I would need the link. You see where I'm coming from?
1] Shukaku got mad when Kurama suggested that beasts were ranked by tails, so no, it is not a given in my mind that Matabi would not get upset that it was replaced with something "better". Athos had a 6-tails chakra cloak that rivaled the 9-tails, so why not a 2-tails chakra cloak? If I were to dump my girlfriend for someone I thought was "better", then unless she has real self-esteem issues or felt no connection between us anyways, then she is not going to be chill with that. Nobody likes being replaced with a so called better. How would you feel if Matabi replaced you with Athos, whose character by some metric is faster, stronger, and better than your character? Is it that way for real, I dunno, but I doubt your character would take that without insult.
2] Invented a few thousand years ago, Face Time is most useful with reduced distances and little interfering noise. Oh, and make sure there aren't any of those saber tooth tigers around. Jokes aside, you can always talk face to face with your tailed beast. I mean, really? Summon it out of training and have a conversation. Show it your fetishes or whatever. Maybe show some jutsu or give them a visual tour of the village. Use the genjutsu to give them a fantasy land in its head. Telepathy really is not the only way to mend fences you know.
Of course, Shukaku would get mad when Kurama says that, as the weakest it's understandable. And until the Tanuki displays feats that prove better than Kurama's, my mind wont change on the subject. When I mentioned Chakra Cloaks, I was referring towards the canon, in which Kurama is really the only one that matters, given that it exceeds further past that of V2 and possibly even the full transformation itself.
Sure, Athos doing the cloak could provide the necessary increase to rival the nine tails, but that's because of his base speed already being faster than most. The cloak Augments the user's stats, it wont be the same, exact, speed if someone much slower were to access the six tailed cloaked.
Your girlfriend analogy is sound, but nothing about this situation will be expressly genuine, as the entire realm is purely fantasy, a fabrication of several minds to simply give an audience. Now, if she had an actual A.I to communicate with, or if this was actually being played out in real life, things will seem far more real. Since we don't your next try fails miserably to dissuade anything about how I feel of my decision. Especially since I already have an idea of how that conversation is going to play out, whether she was summoned or not.
Sure, I won't argue that Athos is a better character, but as I've demonstrated, as have you, being better doesn't mean unbeatable.
While I understand your ramblings, or jokes as you stated, I don't understand the need for them to be present in this discussion. Yes, I can talk face to face with her, it surely would be the path I would take if a mental link was not agreed upon. Something only you have had something to say about. I don't mind giving up 20% of chakra to summon her to have our chats, but I was think more along the lines of convenience. Why have a blue ball of fire, of any size, roaming around a peaceful village, just so the two of you can have your talk, when the two of you can do it through a link?
Now, I see how my words could make it seem as if I believed that telepathy was the only route, and I apologize for that. But for you to come at me and treat me the fool, is widely unwarranted. I know what my options are, I just want to know if a link is a possibility. An agreement or disagreement by the community, for all summoners of the realm. Sure, this isn't the right topic for that particular vote, but if the Oasis is agreed upon, there would simply be another option that's available to the summoners.