Well said Irose. What I, personally object to, is ANYONE having advanced tech in the 2570s, not the 2750s. Reunification War is just completely out of control (IMHO, again) with the sheer amount of advanced technology.
I don't think it is wrong for the SLDF to have advanced tech in the 2570's - I think the amount they deployed was excessive and I think some of the technologies they deployed cause logical failures. For example - the LB-10x began prototype testing in 2590 and full deployment in 2595- but apparently the SL was unable to develop the LB-2x, LB-5x or LB-20x over the next 150 years. Really? I though their R&D was supposed to be so superior to well everyone else.
If you look at the mechs in TR2750, most of the new technologies were introduced in the 27th Century. The few exceptions were:
Endo Steel- first shows up on the Thorn which dates to the late 25th Century
Case - also shows up on the Thorn
NARC - introduced in 2587 -during the RW which it makes sense that new tech would be developed for the war.
Ferro-Fibrous Armor - used on the Kintaro which appeared in 2587
XL Engines - Introduced on the Lancelot in 2581
Double Heatsinks- Used on the Thug which was introduced in 2572
Beagle Probe- deployed on the Black Knight in 2578
Gauss Rifle- used on the Highlander in 2592
Every other L2 tech either does not appear in TR2750 (for example the ER PPC is not used on a single design in the book) or was introduced after 2600. By keeping weapon development slow, you don't have to explain why the SLDF only had LB-10Xs, ER Large Lasers, Streak-2s or Ultra AC-5s with out too much effort. It's because they were new technologies in the mid 2700s that did not get fully developed before the SL fell. (But even this fails since the LB-10X was introduced on the Champion in 2602)
But now with most L2 tech being introduced early we have have a problem where the SL R&D looks pretty lame- look at the 3060s to 3090- the IS introduced more new technologies then the SL did during it's entire 150 year history. We have Light FF, Heavy FF, Stealth Armor, special AC munitions, Light Fusion Engines, XXL Engines, Compact Engines, Heavy Duty Gyros, XL Gyros, Improved Jump Jets, Machine Gun Arrays, MRM, MML, HPPC, LPPC, Plasma Weapons, Heavy Gauss, Light Gauss, PPC Capacitors, Superchargers, X-Pulse Lasers, RACs, Tasers, ELRMs, C3 tech, Bloodhound Active Problem and Angel ECM. And that doesn't include 3rd/4th SW tech such as the full head ejection system, hatchet and TSM.
Either the SLDF Military R&D budget was really small, SLDF scientists were pretty unimaginative or something just doesn't make sense when it comes to the SL and advanced tech development.