I think unless you have allies that don't need you for 3 hours. Well your just not needed period. Your either dead or your allies are already there with victory just about the moment your ready to fight.More likely your on the way to getting gang banged by more than one opponent. Like the Cap only strategy it's ultimately flawed by needing so many level 6 caps. Level 1 Caps are dog meat against a proper player. Also the more caps the harder it is to level them as they share exp. points. Grabbing ships with abilities that enhance your fleet with abilities you don't have as advent is more in line with what is achievable under normal circumstances.
Well on Smaller maps I go for one Progenitor and two to three Raptures if my opponent proves a hard nut to crack with just a spam fleet of LRMs, DFs, and HCs.
On Larger maps is where the strategy really takes off as the Maps I like to play online with friends have nearly a thousand planets with restricted phase lanes with long transit times which means there are indeed frontlines and my Sledgehammer approach will work. Mainly because the games last six or so hours before we even start to really go at it.