Lots of teams probably look back and say, “if only so-and-so hadn’t gotten injured, we would have won the title.” The 1980 Astros are probably unique in that the injury was a near-fatal stroke.
I recall Reggie Jackson in his book saying that about Thurman Munson and his tragic 1979 death in that with Thurman, the Yankees could and should have won in 1979 or 1980 or even 1981.