So, mmh. I was saying earlier that LFWT1 was a slight downgrade to SCS8. While it might be true in an absolutist sense, it's definitely not true for Ling Qi. Upon looking and thinking more about the potential applications of LFWT, it just synergise so much better with Ling Qi's build that it ends up a lot better.
First reason is the interaction with boosters.
While JT worked with SCS, there was very little that we'd actually want to use JT on. GCD + JT would probably have been really good, though it is in that awkward place where we often want GCD up before JT being available for use (though less so with PLR6). OwS doesn't work with JT well, and SCS the tech probably can't work with it, considering it is a 'shit is fucked' panic button. No time for a JT set up there. However, Zephyr's Mocking Escape and Breeze in the Vault both have much more significant interactions with JT. ZME's anti-root/grapple is ranked based, which means that not only would it make the avoid/speed/dr stronger, but Ling Qi would be nigh immune to juggling with ZME (though arguably TRU already does that for her). BV is a "Hahah you can't use C rank perception techs" by default, so using JT on it would be a superlative advantage in a stealth conflict.
Likewise, there was an argument that Sixiang could boost SCS even though her tech says 'music or wind' and doesn't mention Dance, but this was in a 'it would be nice if' state. Sixiang can boost LFWT, which means ZME/BV can be made longer (persistent ZME is a fairly big deal for sustainable movement), and SCS the tech can be made more effective.
The second reason is build synergy.
We have talked a lot on our perception filters. FVM and PLR are both heavy on those, and while FVM might be touching the end of its lifespan (hoping to get a successor within the thread still though), PLR will be combat ready until after the tournament at least. Both Illustrious Phantasmal Festival and Ephemeral Dreamlit Dancer need the opponents to win a perception check to even be able to target us. While it can be argued that our stealth doesn't matter because only the tech's own perception mirage does, I think our stealth does matter, so BV's general "Greatly increases most stealth derivatives while active " should have a significant effect there to boost IPF/EDD effectiveness some more (as well as FVM filter) . Not only that, even if stealth doesn't matter at all... BV still flat out counters any tech to detect, impede or record Ling Qi. This means that regardless of BV's boost to our stealth, opponents will have a very strongly penalised perception rank when making that check, as their tech wouldn't be of use to make it.
The third reason is that BV is just so much better than OwS.
Basically, BV is a real 'fuck you this is what a stealth movement technique can do' pompous arse. OwS could do very little for us. Some damage reduction on a single hit, some significant bonus to stealth, a very niche backstab, and a ill-explained shadowport that apparently followed our own speed (so basically didn't increase mobility once you had GCD up). The main thing OwS did was be cheapish (C rank) and be persistent, meaning it was a long distance ability that you could put up to enhance mobility and stealth for a whole mission from the start. While more expensive, Sixiang can turn ZME from long duration to persistent though, and ZME (or GCD) are flat out better for mobility. BV's stealth is just so much better than OwS it can't be compared, really, so it's a question of Superlative Stealth vs duration + small DR + backstab. I'd take the superlative stealth, thank you, especially with how Sixiang's boosters work.