None of these ring true. The actual reasons: lack of purpose and strategy, combined with permanent record. A resource is only worth as much as it is requested

None of these ring true. The actual reasons: lack of purpose and strategy, combined with permanent record. A resource is only worth as much as it is requested. No readers? No updates. A personal website: if you are not looking for a job, you won't update it. A blog: if you have nowhere to passively promo your website (no twitter followers, no youtube subscribers, no newsletter readers, and you are not otherwise famous) then you must either actively promote it on HN/Reddit (takes a certain mindset) or again you won't update it (a strategy where you write first and then promote might help but target payoff must be so good to outweigh that, and again certain mindset). You'd ask why not just practice around, write stuff knowing no one will read it? Permanent record. Screw up once on your personal domain and 98% of the time it's OK but 2% that's it for life.