But again, I should point out that there's still a good reason for the armies of the Inner Sphere to not have been overflowing with star league tech despite their ten/fifteen year head start on the technology. And that's because they were implementing all this new production in the traditional inner sphere manner, which is to say as stupidly as possible.
As an example, just using the mechs mentioned in TRO 3050, the Federated Suns (not the entire Commonwealth, mind you, just the Davion half) was in the process of building or planning to build seventeen different mechs using advanced technology for their own use (not counting simple field refits like the Javelin or Whitworth, or mechs they were buying elsewhere like the Victor).
This is fairly typical of the time. So the great houses were rebuilding factories and infrastructure that hadn't existed in centuries, and were also immediately pulling those newly built resources in a dozen different directions on different projects with little real overlap. Of course there'd be years of delays actually getting any of that into the field in numbers.
My favorite bit of hilarious nonsense is how Johnston Industries decided to clone the Cataphract with almost entirely new and different parts, and no doubt sank many millions of cbills into research and development into making a then modern and fully realized design suited for production, but had no intention of actually building it because it was just a decoy to draw attention away from a completely different mech, no doubt with its own expensive development program.
Seriously, the Caeser is hilarious.