I have a 2018 camry with more than 155k miles on it. It has never had its transmission fluid changed, so it's still rocking the original fluid. Would it be a good idea for me to change the fluid at this point or should I just leave it as is?

I've heard that changing fluid at high mileages can lead to the transmission slipping.

 

An issue is not changing the fluid WILL cause trans failure. Worn out fluid is the No 1 cause of trans failure.

If my car and keeping it I would change it

You might have issues with some shops changing it as they don't want the risk.

If changing the fluid then just change it. DON'T use chemical cleaners or a do a trans back flush or a power flush, etc.