Well, suppose you have late game, and you have a one or a couple of high level cap ships, (lvl 6+) with all of the nice abilities.
The problem is, you can't use them; the moment you bring your cap ships into the battle, they got insta-gibbed by insane firepower.
Let's a bit honest; how does long your typical lvl 6+ ship survive against 50+ LRMs, 20+ HCs, and now hordes of bombers in 1.09/1.1? It does not take that much good micro to click the capital ship (big size) to focus all the firepower.
Other than Kol, I usually see my capital ships VIRTUALLY VAPORITZED in the matter of a minute, if not seconds. In the end, the whole purpose of capital ships become like this....
1. Quickly use abilities and retreat to neighboring planet.
2. If a capital ship is very durable type (e.g Kol) you can distract enemy player for a while by circling around the planet, but it won't last long.
I suggest, at the level of 6, the total hp (including shields) of capital ship needs to be 10000+ at mininum, or even more.