Couple benefits are by making The pipe bigger you're maintaining the inner diameter of the pipe to the inner diameter of the fitting which keeps your flow rate and also the plastic is always forcing down on the fitting trying to go back to its original size so you're not relying on a piece of metal that can corrode and fail to apply pressure down on the pipe to hold it on the barb.
Expansion is far better at freeze resistance due to the fact it's designed to expand. I usually swap freeze prone lines over to this in buildings that property managers would rather pay for my labor every time something copper freezes and breaks than just insulating lmao
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Is there an advantage to using a tool and seal like this over crimp rings?
Couple benefits are by making The pipe bigger you're maintaining the inner diameter of the pipe to the inner diameter of the fitting which keeps your flow rate and also the plastic is always forcing down on the fitting trying to go back to its original size so you're not relying on a piece of metal that can corrode and fail to apply pressure down on the pipe to hold it on the barb.
Then, if God forbid the water freezes at some point, does it expand again and pop off?
Nope. Expansion pex can freeze without damage.
It can actually take a free along the whole line
Expansion is far better at freeze resistance due to the fact it's designed to expand. I usually swap freeze prone lines over to this in buildings that property managers would rather pay for my labor every time something copper freezes and breaks than just insulating lmao