Hey, it could be worse. Like, the introduction to BT universe in the boxset could be updated to "current" times (3085), but it isn't, instead it's still in late 3067 like it has been for the last ten years. Although, instead of the goodwill of the developers, there's probably a much more prosaic reason for this - there's still not a single full-length source book (written from "omniscient" perspective instead of the in-universe stuff we got now) available that would actually update the universe to post-Jihad times, so an abbreviated version could not exist either...
Also, as for creating an "entry point", it was already there, it was the 3025 era (which is what the rules of the BT boxset still put you in). Relatively static universe, few factions but with strong identities each, centuries of technological decay have made 'Mechs almost priceless, all the IndustrialMechs, AgroMechs and ForestryMechs would have fit nicely there. Then you could have started introducing "booster packs" as a result of the discovery of Helm memory core/Clantech, new factions (Periphery, mercenaries, Com Guards, FRR, first wave of invading Clans, second wave of invading Clans, Home Clans, WoB), etc. gradually without alienating the existing fan base.
Yes, the seeds of Jihad were sown early on what with the then-religious ComStar fervently believing in the soon-approaching End Times (and actively working to hasten them by killing scientists and provoking wars), but back then it was certainly not about the descendants of the Not-Named Clan throwing a temper tantrum when they couldn't get the Successor States to back up their plan of wiping out the Clan homeworlds with their stockpiles of WMD's.