Recommended transaction size

I’ve read it’s inadvisable to make many micro transactions on a Trezor (or any HW) due to the work it makes the HW do if you then want to send the sum of those coins to another wallet. Firstly, is this true? And secondly, if it is, what’s the recommended minimum transaction? Say you were DCA’ing ever week, would it be better to store in a hot wallet until a few buys add up and then send to cold storage?

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