One of the ideas I've toyed with, even before all the AI hype, is a dumb, semi-adversarial servitor. Something to nag or taunt me about chores not done, to interrupt me when I'm doomscrolling, to use as a vessel for precommitment, to challenge me in various ways. I've been too lazy to build it thus far. Many tools overlap the problem space, so I shouldn't be using that as an excuse - perhaps I should give StayFocusd another shot.
Conflict and other stressors - in moderation, within the limits of one's ability to handle - are important for growth and health. A tree shielded from wind is weakened as it fails to develop stress wood and structural strength. A good debate can sharpen my thoughts and mind, walking to lunch keeps my cardiovascular system healthy, rising to life's various challenges gives me the security of knowing I can rise to the occasion and gives me more skills.