Do we once again have that annoying generics problem of only one best thing being taken?
The TLT Y has a huge hit area and so most of the time has a shot. In fact, I'd say in a list with 2 TLTs, the TLTs have a shot 85% of the time.
In our meta, which is moderately advanced (we have worlds level players and multiple tournaments every weekend), no filler ships exist outside the TLT Y and the Z.
The Z doesn't have a problem because it fills in at half the cost of a TLT, so it fills a different size hole.
We haven't seen any IA Xwings or B wings or Kihrlaksdf anymore at top tables. They are abundant for people trying them but once you get near top 4, they completely disappear and are replaced with 2 to 4 TLT lists. With the last 4 tournaments completely won by TLT spam variants.
I'd say that there's little reason to take the 22 point B or IA X due to the 24 point TLT Y being so much easier to fly and has more shots and does basically more damage.