I dither. The only problem is if you have mount issues especially with the DEC axis and backlash. You might find you have a long settling time after dithering - so takes longer to collect lights. But if you are already guiding and using DEC axis also then you are probably okay?
I have a reasonable amount of backlash on my mount. So I only dither every 3 - 5 subs. Which is fine as I use a cmos camera - loads of short subs.
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