Sorry but your point is irrelevant in regards to times affecting 90second burst jobs, as fight design in ShB allowed for fights where burst job like Warrior and Dark Knight to have a stronger showing where there was more downtime during fights, versus fights with full uptime gave sustain jobs like Paladin had a stronger showing. Then GNB being more hybrid of the two types, but leaning more to sustain.

Overall having various buffs windows was not a bad thing, allowed for creativity, allowed for more engaging planning, and allowed for both burst and sustain damage type jobs to be effective. 2 minute buff meta is more punishing, 1 death can throw everything out of alignment, having certain mechanics happen during buff windows can lead to janky alignment issues, p7s for example where some fail to hold buffs before being yeeted up at the 6minute buff window, while others don't, causing a weaker 6 minute and subsequent 2 minute windows. While before this 2 minute meta it wasn't as bad since you could still line up buffs with trick attack after deaths or misaligned buff, so you don't lose a use.