In the spirit of playing devils advocate about a largely irrelevant subject, as ultimately in YTU you do whatever you feel is best. By the resources available in CT, Battledress has only a max ruled TL of 14, there is not TL15 version.
There is TL15 electronics and weapons systems, etc. to fit to it though.
Also book 4 (merc) says troops are equipped with FGMP-14. No one uses the FGMP-15 as the cost is so much greater.
They would use an FGMP14 manufactured at TL15, much like TL6 assault rifles are now manufactured at TL7 with TL7 materials.
As the stats the same. So BD imperial infantry in CT are still equipped a TL below imperial max.
Only the armour, and even that will be TL15 manufacturing prcocesses rather than TL14 so if you use LBB:4 rules it is reduced in price by 10%, he electronics, point defence etc will be TL15.
Also in FFW game, the divisions and brigades (for both Imps and Zhos) have a much greater frequency of one below max TL.
I posted the numbers, there are very few TL14 regular Imperial units, I can go back and repost the numbers.
There are 7 TL15 5c field army regular units, only 1 TL14 5c field army, then there are 4 TL15 1c corps, and 2 TL14 1c corps, 5 TL15 20 divisions, 3 TL14 20 divisions, 4 TL15 10 brigades, 2 TL15 5 regiments, and 2 TL14 5 regiments.
Total combat factors - TL15 40c +50 or 4050 in total.
TL14 7c + 70 or 770
The white on red colonial forces include a further 2 TL15 5c field armies for a total of 4550 TL15
The bulk of Imperial Army and colonial forces are TL15.
Now onto the marines and huscarls - there are 8 TL15 5 marine regiments, total 40., and 6 TL15 1 huscarl batalions for a total of 6
Running total 4596 combat factors of TL15
regular TL14 forces 770 combat factors.
So I would suggest that actually all those armies and corps if split down, would not consist of all TL-15 (or TL-14 if Zhos) divisions and brigades. But rather they are an average of the provided combat values. So whilst there is an average of TL-15 there will still be a 30-40% TL-14 at Division level.
The counters and rules do not support this, as you could face a situation where the TL14/15 ratio is affected by casualties and thus degrade the unit to a lower TL, there is no such rule. (but would be an interesting house rule addition to the optional rules...)
Other than using ACRs which are unable to penetrate Zho CA, which I agree is silly (but they could use (AP rounds set of the CSC rules) what does it matter if the majority of your logistics and infantry are lower TL (assuming you can’t have everyone in, for whatever reason, BD and FGMPs).
The gauss rifle is far superior an is TL12.
You want the real sharp end of your assets to be TL-15/14. Your tanks, assault troops, speeders, MA artillery etc. It’s in these areas where the battles are really won or lost. Infantry are just there to slow everything down and stop wars descending into everything being flattened by extremely potent firepower.
And once again we need to take a look at the actual battlefield changes as TLs increase. In the past a major Imperial advantage is meson artillery at TL15. Now meson ortillery can be provided by gunships... at TL11. On a meson battlefield mobility and dispersion are key, too many units in close proximity and you lose the lot to one meson blast.
So perhaps FFW game can be thought of as the TL that best reflects where the average amount of combat values (CV) came from. In a 20 CV division I would imagine 6 or 7 of that would come from the meson batteries alone. Perhaps 5 from the infantry and the rest from armoured assets and speeders or more traditional artillery. But this is the great problem with FFW the ground combat doesn’t really work. I made my own version in lockdown that gave each unit a Firepower and a separate damage absorption value and removed TL completely. Infantry would lose firepower a lot more slowly whilst if armour could be damaged it would start to loose effectiveness much more quickly. Trying to reflect the ability for infantry to stick out a fight despite a loss of command and organisation. It was much more satisfactory. It all fell apart when I tried to add logistical requirements in and I started to need excel to keep track of everything. But the idea I had was the imperials main asset was they needed a lot less logistical support as they were able to make a lot more on the battlefield whilst the zho relied on a much larger tail.
That sounds really interesting.