@lorem_ipsum What are you talking about UEF doesn't build their BS until navy is won? That could not be more incorrect, battlecruisers do not replace battleships except in specific situations. One being that you're vs a cybran player who's only making frigs, and even then it's not a replacement as they fill different roles.
And yes, you build a lot of frigs as any faction on navy, it's absolutely correct to build frigs from multiple t3 factories and if you're not doing that you're not playing it correctly regardless of the faction. Especially if you're playing cybran, frigs are 100% a big part of their t3 navy strength, it's just how navy balance works and is different from air and land balance.
Edit: Different as in on land you don't build t1 tanks at the t3 stage, and on air you don't build inties when there are asf out. Obviously this isn't a hard and fast rule and there are probably exceptions, but never to the extent that frigs are used late game.