What to batteries have to do with clothes dryers...? You're comparing a consumable good to a household appliance. Household appliances are expected to last 5 years. 7-10 is pretty normal.
Batteries not lasting long is considered a limitation of our current battery technology. This limitation doesn’t currently exist for typical clothes dryers.
There’s no reason to introduce a new limitation unless the technology makes up for it in other ways. Having to replace a clothes dryer every two years would require the technology to be very good to justify such a burdensome task.
"Having to replace a clothes dryer every two years would require the technology to be very good to justify such a burdensome task."
Or, a cost cutting measure of replacing a long-lasting ball bearing assembly with a shaft rotating in a vinyl cup which wears down to metal-on-metal like mine did after 3 years. Which is the sort of accelerated deprecation the OP was alluding to. Granted, the battery metaphor isn't great as energy storage tech is far from mature.
The delivery fee is a significant fraction of the total cost of a modern dryer in the US. Saving a little money by getting crappier dryers will likely have a larger total cost because of the delivery fees, and also the cost of your time in taking time off from work to accept delivery.
Arranging large appliance delivery and disposal is a pain in the ass when you've got full time jobs to deal with. Don't want to do that any more than needed.
No - I'd really love it if they didn't become disposable. Sustainability, however, isn't why people have different expectations of batteries vs dryers. I didn't mean to imply a cheap, portable, but flimsy dryer would be a good thing.