It's not so much "forgotten" as it is irrelevant. The term "steampunk" was coined merely to sound like cyberpunk, and maybe to poke fun at how pretentious it could sometimes be. But it certainly wasn't ever intended to mean anything akin to "folk-heroic rebels on the margins of society, sticking...
1d20 + ascending attack bonus ≥ ascending AC starts as single-digit addition compared to a double-digit target number and only turns uglier as levels get higher.
1d20 + descending AC ≥ THAC0 starts out as single-digit addition compared to a double-digit target number, but as the levels go up...
I got into the hobby in the 90s — the 1106 D&D tan box and AD&D 2nd Edition — and the way everyone around me played was trad. Plotlines, protagonists, and playacting. If you could railroad under the table to make a story happen, awesome, that meant that you were a good DM who cared about...
It makes two other noteworthy changes: BFRPG has no alignment mechanic in the core rules; and the all-important 1 g.p. = 1 XP rule is relegated to an option (like in 2e).