Do I need air fry and sous vide functions?

Reviewers are split. Pressure Cooking Today and Serious Eats both note sous vide on Instant Pots is convenient but less precise than a dedicated immersion circulator — r/sousvide users measured temperature drift of several degrees on Ninja's version. Air fry lids add bulk and a second basket to clean; many owners on r/instantpot say they end up not using them.