I dunno if you've had a lot of Toyotas, but this statement might well could be Toyota's corporate motto. They're a very conservative car company and honestly that is part of the reason I was drawn to them and have stuck with them. While the Big 3 and European makers constantly tinkered Toyota (and Honda, Nissan, etc. to some extent) kept dialing something in until it's right and then don't change until they have to. I was just helping a friend trouble shoot his electrical system and it occurred to me that for the 22R-E trucks Toyota's wiring harness is essentially identical from 1985 to 1995 across a generation change. Why should they change it? No reason, so they didn't. You could almost trouble shoot any truck from 1979 to 1995 with the same tools and books, more or less. Parts are interchangeable. Heck, the e-locker from a 2014 will fit into the housing for a 1979 with only the slightest of need to grind a small notch. They seem to get burned when they try something new and that becomes corporate policy, e.g. the U.S. lack of diesels. They didn't do well in ~1985 and that mentality /still/ makes them shy off trying again. OTOH, it took them 10 years to presumably fix the driveline vibration issues and of course they never really did totally solve the 3.0L headgasket issue, so going slow can cause a lack of response as well.