What is the impact of planeswalker summoning sickness on gameplay in Magic: The Gathering?

Planeswalker summoning sickness in Magic: The Gathering affects gameplay by preventing newly summoned planeswalkers from using their abilities or attacking on the turn they enter the battlefield. This limitation can impact strategic decisions and timing of when to play a planeswalker, as players must consider the risk of leaving them vulnerable to attacks or unable to use their abilities immediately.