Currently MWO has a TechBase set in the Civil War era. It generally does not include prototype equipment, with the exception of the L-AMS (and even that might just be a misunderstanding).
So here is a comprehensive list of all the weapons and equipment of the Civil War era (3062-3067) which PGI did not implement. Obviously melee weapons and certain Tech not represented in MWO anyway (UMU, C3, etc.) will not be on that list. I am using the Universal Technology Advancement Table from the Interstellar Operations Sourcebook, which a complete and recent canon source.
Clan:
ER Flamer (intro 3067, cf. IO p.41)
Heavy Flamer (intro 3067, cf. IO p.41)
Laser Heat Sinks (intro 3051, cf. IO p.42)
Inner Sphere:
Light Active Probe (intro 3052, cf. IO p.40)
Light TAG (intro 3053, cf. IO p.41)
Single-Shot (OS) Missile Launchers (intro 2676, ret. 3030, cf. IO p.46)*
Improved NARC Launcher (intro 3062, cf. IO p.46)
Small Cockpit (intro 3067, cf. IO p.39)
Heavy Duty Gyro (intro 3067, cf. IO p.48)
XL-Gyro (intro 3067, cf. IO p.48)
Large LFE (intro 3065, cf. IO p.44)
*strangely it is a weapon exclusively for the IS according to the IO, despite the fact that in the novel Blood Legacy featured a Clan OS SRM launcher (cf. ch.19). Not that it matters, nobody would use it.
So did we miss much? I do not think so. Some stuff is hard to balance and implement, and probably was excluded on purpose like the small cockpit.
The new flamers might be nice for troll builds but they are still flamers. The only good and easy item on the list is the IS Light Active Probe: because it has the same stats as the C-LAP it would be a notable improvement over the much heavier and bulkier BAP. For a third of the weight you get an almost as effective piece of equipment.
But even the IS-LAP is not a game changer. While PGI forgot to include a few things (and I really suspect they just did not know), there is no critical omission.
Edited by FLG 01, 07 August 2018 - 07:34 AM.