Old topic I know, but just thought I'd add my experience.
I had a trigger movement coached into me at age 11 by an international cricketer. It served me well for 18 years, but last season I decided to ditch it. Not through poor form or anything like that, but just because the arguments for not having a trigger made so much sense - keep you head still, kept things simple etc...
My first triggerless year was ok, without being spectacular. I missed 6 weeks of cricket due to the birth of my daughter, plus having always batted in the top 4 all of a sudden I was batting 6-7. I had lots of 20-30 not outs but no really big scores, partly due to where I was batting in the order.
This season I've been atrocious though.
So I got to thinking, last time I had a 500+ run season, was there anything in particular I was doing differently? The answer: yes, I had a trigger movement.
So I've decided to try and get myself back in the habit. Yesterday was the first match and I hit 32, my first meaningful runs of the year.
My footwork felt a lot better.
So think I'm going to stick with it. The reasons don't really make sense, it just seems to work for me