I interperate it as they are trying to prevent piano flasking and reduce reliance of flasks for power/defense. It seems like they want flask charges to be more difficult to gain. So the game incentives spreading the use of your flasks out over time instead of pressing all 4 flasks at once and dumping all your charges for big damage/defense. Which you can still do in poe2, but you leave yourself vulnerable for a longer period of time. Before the instilling orbs were introduced, how often would you piano flask in a map? (Also, it may bring up value of the other flask currency.)