1. Do you realize that flak are a) expensive long to construct? flak does reasonably high total dps, but its very low vs. each unit. shield regeneration, repair cloud and similar stuff makes flak strategy much less effective.
2. Why on earth would you need flak burst if you are spamming flak?
3. With flak, you will be quickly outspameed early unless you are very far from the enemy. Vasari cant be countered - sb eats flak alive and flak cant even kill it when its being built. The same applies to ravastra spam with a kortul, cause lvl 6 ability will eat you alive unless you can disable it or retreat from it (not to mention vas lf reintegration). In first case you will need more money, and if you have it why not to go lf or lrm and simply outspam the enemy? in second you will do next to no damage.
4. If you turtle why cant I eco and turtle too? ankylon is very bad at beating sbs
5. Given the cost of flak, why cant the enemy go HC?
6. Tec is generally very bad militarily late game, except for their defense, and if you win with lf and make the enemy eco fleet, you have already won the 5s
7. You will have trouble clearing the planets with flak, which means you cant level your cap fast
8. Sins gods? LMAO. i will rape u alive whatever u use - lf or flak. cheap trolling
9. How are you going to counter enemy titans with flak?
10. Even if you CAN get to the point where you got lvl 3 tit and all the stuff...
vs TEC you might have some chance, but only if he didnt get that feed you got for titan. They still have demobots, their own tits, MB...
vs Vasari you will get raped by orkie even with minimum upgrades, cause flak do next to 0 single target dmg
vs Advent they have the repulse, titans, wail, radiance will drain your tit am, repulse will split your fleet, Illums with malice, destras, and even mass discs will make your flak dead
P.S. Sorry for serious answer to a troller's topic