Preventative maintainability of modern things seems so low - either tech is over complicated or has short lifespan or take too much effort/time/money. Maintenance also requires a network of appliance service companies tied up to the OEMs - and frankly they should be selling subscriptions and coming by to service appliances proactively - kinda like our dentists. The incentive structures are probably not right for this.
Sure, some things it makes sense to trust in those more skilled than you, with the proper toolsets and experience to finish a job correctly and back the result with a warranty, like larger vehicle maintenance tasks, plumbing, and major structural home remodeling.
But... so many things are not worth the premium that it boggles the mind.
Changing a light switch? 10 minutes and a screwdriver is all you need to save a $75 house call.
Replacing a door handle? 10 minutes and a screwdriver is all you need to save a $75 house call.
If you are willing, able bodied, and strong enough to handle the appropriate tools, then you owe it to yourself and your wallet to handle the things that you can handle and take the money you save and use that to help cover the things you cannot.