In MT every design is TL15 because DGP broke the ship construction system. Source MT Imperial Encyclopedia.
There's also the fact that Max TL "makes things EASIER to build" in SO MANY ways that it's basically a Cheat Code.
The ... pattern ... for that was largely established by LBB S9.
Of the 28 craft featured in LBB S9 ... only SIX craft are NOT TL=F.
- Scout/Courier TL=9 (p11, LBB2 legacy design)
- Express Boat TL=A (p12, LBB2 legacy design)
- Gazelle-class Close Escort TL=E (p17, LBB5.79 legacy design, with a "cheat" of putting 4 turrets onto a 300 ton hull)

- Mercenary Cruiser TL=C (p21, LBB2 legacy design)
- Gig TL=D (p27, LBB5.80 design)
- Azhanti High Lightning-class Frontier Cruiser TL=E (p31)
The other 22 craft featured in LBB S9 are ALL ... TL=F.
The 21.4% (6 of 28) craft that are NOT TL=F are all
rather obviously the superminority and are all rather obviously "inferior" designs compared to the
BESTEST @Everything™ TL=F craft which are the supermajority of craft featured in LBB S9.
All things considered, this is substantially "Fair" simply because the vast majority of craft featured in LBB S9 are naval vessels used by the Imperial Navy, so TL=F "makes sense" for all the destroyers and battle wagons.
By contrast, the craft featured in LBB S7 are
mostly TL=9-A:
- Express Boat TL=A
- Express Boat Tender TL=A
- Scout/Courier TL=9
- Far Trader TL=9
- Subsidized Merchant TL=9
- Assistant TL=9
- Seeker TL=9
- Ship's Boat TL=9
- Pinnace TL=9
- Cutter TL=9
Relatively few craft in LBB S7 fall outside of the TL=9-A range:
- Gazelle-class Close Escort TL=E (LBB5.79 legacy design)
- Gig TL=E
- System Defense Boat TL=C
- Jump Shuttle TL=C
- Launch TL=8
The point here is to use the
minimum tech level necessary for construction of the craft with desired capabilities in LBB S7 (and that minimum is pretty darn minimal!). So if anything, the Precedent Is Set™ that for FRONTIER work, TL=9-A is a pretty solid assumption that ought to be getting made.
The only reason the Close Escort "needs" to have TL=E is so that is can mount the "newfangled" Particle Accelerator Barbettes onto its hull (which require TL=E and an obscenely high computer model to hit anything!) ... and ... to "permit" J5 under LBB5 custom drive paradigm rules ... along with the tonnage savings of Bonded Superdense Armor @ TL=E in order to be able to CRAM everything into a hull size "too small" for everything to fit into reasonably, while also showing off the "new" L-Hyd Drop Tanks feature (without adequately explaining how to make it work right). So to say that the Close Escort is "something of an outlier here" is quite the understatement.
The overarching theme though is that (entry level, penny ante) commercial merchant craft are expected to fall into the TL=9 "bucket" ... and the Scouts actually
"splurged" on TL=A for the Express Network (to make it "fast enough" to operate).
Close Escorts are an obsolete Imperial Navy craft (because, TL=E).
The LBB S7 System Defense Boat (TL=C) is simply an "example" of what can be done with boats (J0 craft) that are maneuver only combatants at lower (than TL=F) tech levels produced domestically for local system defense purposes from in-system construction yards, but which can be exported to nearby worlds(!) to bolster system defense patrols beyond the home star system doing the construction (see: Shared Defense doctrine).
The Launch can "get away with" being a "nuclear teakettle" @ TL=8 simply because the craft is limited to 1G maneuver.
In MT every design is TL15 because DGP broke the ship construction system. Source MT Imperial Encyclopedia.
MT ... "broke" a lot of things ... including the Third Imperium setting.

Breaking the ship construction paradigm was just a "bonus" ...
