Best of five finals are a rarity in CSGO. The players do not want to play a best of five finals. However from a spectator perspective it is an exciting prospect for the viewers. We love to see the teams stretch their map pools and go into really deep finals.
Thoorin recently made a video vouching for Best of Five finals in more tournaments. The last Best of five tournaments that we saw regularly happened almost ten years ago.
IEM Sydney will be continuing with the success of the IEM Katowice finals success and be having a Best of Five finals for the IEM Sydney tournament to be held later in this year.