I don’t have any problem waiting one turn for get a full team burst after using PF.
Shingen first skill give her 20% burst, and Mikael skill another 20% burst. That means just 10% to fill in one normal attack turn, and in the second a full burst team.

But my main concern is the HO relic doesn’t increase the attack of my light team. I would need to replace an assault weapon for that, and just that decrease my team power. I don’t know how better are Mikael skills when she awaken. If she can buff the burst attack of the team as PF I gladly buy the shingen assault weapon.

But that the question. Is it better burst attack or elemental attack at the end? I can’t choose.