I don't track because I have no need to.
My investments are pretty much 95 VTSAX / 5 VBTLX. I don't trade, buy, or sell except (a) an occasional tax-free transfer between bonds and stocks in my traditional IRA to rebalance back to my AA, or (b) sell when I need some more money.
I've never met anyone (other than Buffett, and I haven't met him either) who has beat the market on a risk-adjusted, after-tax basis over any period of time beyond a few years. So I have no desire to actively trade.
I also don't really monitor VTSAX and VBTLX. I used to check to make sure that they were essentially matching their indices, but they always do, so I've stopped bothering.
I've been investing since 1987, and have been >90% invested in VTSAX or VFIAX or similar during that time frame. Whenever I've looked out of curiosity, I usually get a CAGR of between 9% and 11%. If you have a decent career, invest 20% of your pay over 30 years and get 10%-ish CAGR, you'll be fine.
...
I guess the one tracking thing I still do sometimes, although this is getting less frequent, is to check my total stash size is still >25x expenses. Currently it's about 116x expenses, so I really don't need to bother looking, unless the apocalypse actually does happen. (The way things are going I'm not ruling anything out!)