In terms of out ranging minbari - excuse you what?
You don't get a weapon with more than 18 inch range until Raid level (and then on one ship only). It has 20 inch range and 2AD. At battle level you can get up to 4AD at 25 inches. At war level, you can get 30 or 36 inches.
EA have 30 inch weapons at Battle level, Narn have 20 and 30 inch weapons down at Skirmish, Centauri have 20 inches at Skirmish and match Minbari up to War level, 35.
The simple fact of the matter is, Minbari ships, without stealth, looking at their peers, almost unilaterally have fewer AD and are underhulled and have fewer hitpoints without the benefits of interceptors, GEG etc.
It's not about being able to 'win a game where your opponent plays better and selects a better fleet' - it's about being able to win a game where you choose a good fleet and play well, regardless of how they play - with the primary defense of your ships significantly reduced, this is a big problem. What would the Abbai or EA do if their Interceptors suddenly only worked on a 5+ every turn, against each ship that was shooting at them?