Other than release of air bubbles, no.
Most people who use a res do so because there's a pump in it.
Some people use a res, and prey that it adds to the cooling, or is super effective at removing bubbles.
Some people state that they have a res when really, it's an airtrap, and isn't as large as the name implies.
A lot of people report using the Tee as an airtrap.
Here's mine (below). I've rebuilt it since then, with 3/4 fittings, instead of "1 1/2".
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