For a coin, investors and holders's mind is important. If burn coin made them believe a coin will be increased, and then it is something good. Because if people believe less supply means more demands, they wouldn't want to miss the chance and then buy the tokens too. It can cause pump for a coin. But people really should know this because i read from social media that there are people who think to "burn"  coin that they bought, and don't know if they gonna lose the coin. Only developers who must burn their tokens and not us investors or holders.