The Intensive Focus skill is what allowed us to hear the Music marching drums of the Shishigui army a month ago, in an application that we hadn't really predicted. I don't think we need another skill yet since the one we've got already works with the themes of HDW's Music, RME's Clairvoyance, general Qi sense, the feel of Wind and Mist etc. and other basic senses. Intensive Focus is really interesting when we have multiple methods of perception because it allows us to use the best one in every situation like hearing from far away, seeing in great detail or perceiving a chaotic battlefield with out Mist and Music. Just as we wouldn't have heard the Shishigui without some specialization in hearing, there are many things we couldn't do if we solely relied on hearing over sight and more esoteric tools. While I'd love to create a tight-knit skillset I don't think the way is to discard some senses over others, but rather to unite them as a cohesive whole.
I liked the Wind chimes idea because it can be different things narratively. It could play Music that expands our perception where it reaches, it could hear distant sound and enhance it to our ear, play at the disturbance of Wind as someone sneaks up on us or act as an alarm where the talisman lets every sound or movement of wind play on it to draw our Intensive Focus to what disturbs its chiming. For such a simple design it covers an array of facets of our perception, and that gives Yrs more to work with.
it is not like Intensive Focus would be removed by getting another skill. Also, switching to a music/hearing based perception art and even skills doesnt turn us blind. The general Qi sense would still be there and so on. Meizhen for example also still has her other senses besides whatever she uses to taste things.
And while Intensive Focus is decent enough flavour as something to support another perception skill, i would argue that having it be the 'main flavour' for our Perceptionis less ideal, especially since the more advanced skills derived from it would likely follow the general theme of the predecessor skill. and all that theme really is is 'focusing really hard on one specific thing'. That is a lot less impressive than something like Vanishing, Sable Grace or Dream Step. There is also an argument to be made that we dont want to have tunnel vision focus all the time, sometimes we want to have a 'broader' perception. We want it sometimes, and we still have it for that, but as far as main flavour goes Intensive Focus doesnt seem too impressive.