Do u still need hair protectant when blowdrying with cold air

I always seem to see everyone saying to use heat protectant but theres no heat to protect my hair from? I use the cold setting to dry out my hair focusing on the roots but i dont use the heat setting. Do i still need to use heat protectant or are all these youtubers tiktokers using heat to dry their hair? I prefer it to airdrying as my hair feels a little softer and less frizzier when i blowdry plus my hair takes quite long to dry and i dont like having a wet head for hours especially in winter.