You must be one of the most careful users of tools there is, or only work on non-stuck fasteners. I've plain worn out many #2 phillips in the last 25 years, and I'm not counting cheap craftsman or stanley ones that only last one or a few uses. I break very few screwdrivers, although I have broken maybe 10 to 20 small flat screwdrivers; I work on guns a lot, that's just what happens sometimes. Same with small torx; I go through a lot of them.
Plain and simple, screwdrivers wear out and are consumables, even if they're just used for driving screws. Cheap ones are consumed much faster than better ones, in my experience. When I stopped using the cheap Craftsman ones about 15 years ago, they had gotten to the point that the #2 phillips often deformed and were useless on the first use. They would round out, but I could go to the box and get a Snap-on or SK or Proto or old VA and take out the same fastener without a problem. I have a few Craftsman pro with the black handles that I got on warranty, and they've held up better, although they are wearing out also. I have a huge Craftsman flat driver that has done exemplary service as a paint stirring stick. I've been using it for that for about 20 years, and it's still performing perfectly for that. I also use it for prying off the lid.
I turn in my Snap-on phillips periodically for warranty replacement of the shafts, to me it's worth it to own them for the warranty, but more importantly because they wear longer. I have one in my electricians tool belt that has been used steadily since 1989, it is finally getting worn enough it will have to be warranted soon. I regrind my flat snap-on and re-square them periodically so they perform better, eventually I have to turn them in on warranty when there's not enough meat left to keep re-tipping them.
I use the cheap ones for tent stakes; they're great for that, work a lot better than the bent wires that come with the tents. Easy to hammer in, and easier to remove.
I use flat screwdrivers all the time for opening paint cans and doing minor pry jobs. I can't recall ever breaking one doing that, it's the least demanding of the uses for them. But then again, I use a thick wide one, not a small delicate one. Where they break is when I have a rusted fastener, one that is loc-tited in, steel in aluminum, or a large fastener in hard wood. They start getting a little twisted, and after a few times of that, they crack and one side breaks off. Time to re-grind.