Regarding the OMY comments, I sometimes calculate this based on what it does for my discretionary spending after taxes. As long as I manage my MAGI for ACA for 15 years, my barebones expenses shouldn't change except taxes longer term, so the extra stash would just be for the extra spending, having fun, traveling, eating out, etc. So, as a single person, OMY would basically allow me to spend about $3000/yr more on discretionary spending. That's only $250/mo, or about 10% more than the $30,000/yr that I already have planned for discretionary spending. In my view, 10% increased entertainment/travel spending does not equal 10% more enjoyment or happiness. In fact, I think the extra 10% would be so little as to be insignificant in how much I enjoy FIRE. I can't justify one more full year of my life chained to my desk full time just for a 10% increase in my entertainment and travel budget going forward.
If you're in your 30's, OMY should be easier to deal with, but at 50, it gets more difficult to give up each year to a full time job. Also, if you're cutting is closer to your basic expenses with a low discretionary budget, $3000 might do a lot more for you. In my case, I feel $30K/yr for discretionary spending as a single person is plenty.
Of course, OMY can also provide more of a cushion in your stash if the market drops, but with my $30K discretionary and 60/40 AA, I shouldn't feel a need to OMY it unless things get really bad, or something happens with ACA to screw up my healthcare budget in a big way. I still might stay on part time OMY, but that's a lot different to me than working full time.