Renting things is a financial tool and it can save you money. The calculation is simple. You estimate the difference between how much something costs and how much you can sell it for once you're done using it. That's your real cost to own it. Compare that number to the cost of renting it for the same time period. If the cost to rent is lower, renting is a better deal.
For larger and more involved transactions (especially homes) things get more complex, but that's still the basic arithmetic.
Making more things rentable isn't a big problem. The big problem is that many people don't understand this arithmetic so they end up shooting themselves in the foot when you start giving them options. And unfortunately the people who need this knowledge the most are often the least likely to have it.
There's a simple solution which is to just teach a great personal finance curriculum in high schools nationwide. (Well, as simple as solving a problem for hundreds of millions of people is going to get.) Of course this being HN we can probably dream up fancier solutions like incentivizing people to take some personal finance training online.