Mixing by weight can be fantastic with the right scale. I still mix by volume sometimes, I kind of enjoy both. But, I think mixing by weight may be faster, although at this point, I'm often fairly accurate with most stuff besides nic and flavors, and since I mostly am mixing 100 mg batches, I will sometimes just draw a "line" where my VG, DW and PEG400 needs to reach, etc. It may not be the most accurate method of all time, but it's fairly accurate and works fairly well for me. When I mix by weight, I feel there may be more accuracy, and less hassles with cleaning up equipment, that is where weight can really shine.
Glad you found a method you enjoy, I think a lot of folks who try it wind up with the same reaction as you "it was so much easier!" LOL. Congrats, and I'm glad you are enjoying the method. I just kind of enjoy DIY generally, I'm not sure I'd necessarily choose one type of mixing over the other, it kind of depends on how I'm feeling that day. Yep, I'm weird like that. There is something rather satisfying about syringes and pipettes and all for me, but my dad used to take me to the lab with him on weekends, so I could fool around pipetting and whatnot, it was pretty fun.
And, since I worked in genetics until my son was born, well, I find the whole process pretty easy (and, I don't have to swaddle myself in a full body suit to deal with the mutagens, EEK, especially since I was doing that for ALL of my pregnancy. The kiddo turned out okay, thankfully, if any mutation happened, it was probably positive. LOL.
Anna