Because fnatic only won 15-13 and especially against karmine corp Hiro was ridiculous so the other teams might of thought it was a map that had weaknesses they could exploit but fnatic have simply been getting better at it the more they play the map
Yeah hopefully it means we'll see more astras soon but I heavily doubt it unless people actually try to play abyss correctly instead of playing a default comp like apac did (seriously no breach or harbor or anyone good for the map is crazy)
fnatic are like geng imo, it takes them a while to get used to a map in this case sunset, gen have been perma banning it and now they look decent even tho their comp is terrible