I'm happy with my 3V system, brewed batch #147 yesterday, took about 5 hours with clean up, but that is not 5 hours fully occupied. Now system is dialed in, I can do other things during much of the mash and boil time, even sparging does not take full attention for whole time it takes.
I could go into time saving tips, but is probably off topic and covered in other posts.
All 3 vessels are made out of 15G half kegs, converted from propane to electric about 110 batches ago. That was a real time/effort saver, and with electric, one does not have to monitor flame, boil status & temps much. If OP still has 3V system, probably not that hard to convert.
I brew 10 gallon batches and like the control and versatility of the 3V. While it may seem to have more moving parts than a 1V system, it is in a way simpler, and no there are no equipment failures I can't easily work around to save a brew day.
All that said, I could see being happy brewing with a 1V system if doing smaller batches, or if I want to brew indoors, or if alternative was not brewing at all.