IMO, the key is considered useless is because it drained whooping 100 stamina and the key comes in rather 'limited' number. There's not much different than farming it on Wednesday and Sunday at all. Same drop rate, same stamina. The only perk is that you can summon whenever you want. It would be good if it consume less or no stamina/ drop rate for lv,100 manyu increased/ got some additional bonus like LCs or better yet, 1 ampy per key used. Just one of that would be great.

Gacha this time is rather meh for me. Sankasaboten is kinda okay, never like Daisy that much, and Wormwood is not in my taste range. Although critical gacha tempt me so much. But I doubt 200FG would be enough to get a rainbow from it.

Revamped solar blast allow some strategic nuke on strong enemies without wasting solar crystal. Girls with solar blast booster or crystal drop boost would be more useful in team making.

And lastly, it's been a month since long maintenance for GS. Really miss it now.