The point went right over your head. Not surprising at all but I've noticed a pattern that your way is the only way.
And you really know nothing about me at all. I've never mixed by volume. But I don't push by weight mixing on anyone as the be all to end all. I simple advise people on what works for me. But what works for me doesn't always work for others.
When I got into DIY I researched a lot. When I looked at weighing something just clicked with me. So I got a set of scales from amazon, $22, flavors, nic, VG, PG, $76. So $98 total investment that paid for itself in 2 batches.
If I had done syringes, beakers, and auch, my investment start up would have been more.
However to a retired science teacher that has these things laying around the investment for him may be quite cheap.
I know plenty of people that mix by volume. You make this thread seem like it's the only debate thread on mixing by weight or by volume. There is a big world out there. Open your eyes. There are more threads, more forums and more ideas than your closed mind can wrap around.
Final point, because it works for you It's not THE ONLY WAY TO DO IT.
Tell people what works for you. Let them decide for themselves what works for them.