I was surprised to see how in-depth and detailed these objectives are. Not to knock the author, mind you; the dedication to breaking these things into granular tasks is impressive. Rather, I feel that there's little room for flexibility in taking an OKR approach to personal development.
Case in point, I had a personal objective to do more service in the community in 2020. The way I had envisioned the key results was more volunteering, more interactions with people, more things like spending weekends working on a Habitat for Humanity house or something of the like. The pandemic really disincentivized those kinds of in-person activities for the sake of the community, so I pivoted to identifying more causes I could donate to or provide help to in remote ways. It was hard, no doubt, and I was still disappointed that I didn't get to do the former things, but considering the circumstances it _feels_ like my original objective was achieved. The takeaway is that I think personal objectives that leave little room for flexibility are fighting an uphill battle from the start.