Accuracy is overrated if you are only mixing for yourself.
it is clear from this thread that most of us who have been mixing for a while have sacrificed a bit of accuracy for an easier life.
These days I mix in a cylinder straight from the bottles, no syringes, no scale calibrations, or zeroing after each ingredient, no weighing your vg to work out the grams/ml, no batteries to replace or device to replace when it fails. Every couple of months i mix juice then have to wash one measuring cylinder. So imo if folk want to use scales that is fine by me, but saving on lots of mess and washing up is only true when scales are compared to a messy method and there are ways to mix with sufficient accuracy for most people, that do not require scales.
I sometimes use the shortcuts others use of premixing large batches of vg/pg with or without nic.
A shortcut nobody has mentioned yet is to premix your flavours once you have perfected your recipe.
Edit- Accuracy does have its place and I did learn a lot during my time accurately mixing complex flavours that has helped me with my current slap dash mixing method.