They did. They also added either dual floppy drives or an internal hard drive, along with a few other changes Jobs would have disagreed with (internal slot, for example.)
Everybody's a comedian. And if you're not trying to be funny, you're missing the point. First, we're not talking about a re-design, we're talking about adding a fan. As far as that goes the analogue board in the Mac Plus was updated at least twice between 1985 and 87. Second, the M0001 was a notorious overheater and found itself in the shop for repairs quite often. At a time when Apple needed their computers to be reliable adding a fan to the Plus would have done wonders for customer relations. Yes, many third party solutions were available, but how do you say to a customer, "I'm sorry your Mac overheated and died, perhaps you would like to buy a third party fan for it after we repair it?" Or better yet, "we're selling you an under engineered computer, so you might want to buy a fan for it to prevent repairs." That would sure upset me. Also, for many of those repairs, Apple had to eat the cost under warranty, something a cheap, easily added-on fan built-into the sales-price would have significantly lowered. Then, we have the fact that the Plus was sold for a full 3 years after the SE was introduced ... so adding a fan at that point only makes sense.
I wasn't trying to be funny. I was just pointing out that the market recogized exacly what you are saying and offered internal fans for the Plus, 512k, and 128k. If there wasn't a need, why offer it?
Yes, you're coming late to the party: Jobs was long gone by the time the Plus came to market and certainly by the time the SE & Platinum Plus with the revised analogue board hit the streets. There was no love lost at Apple to prevent them from sticking a fan in there and mitigating their repair costs.
No, sorry. The Plus is clearly modeled after the original 128k and 512k machines. Same case, same lack of a fan. Things didn't change until the SE was introduced. Also, Jobs left Apple in September 85, the Plus was released in January 86. Jobs would have still been with Apple at the time the Plus was being developed unless you think Apple could have pulled off designing, testing, marketing and everything else that needs to be done in preparation for a launch of a new product in under 4 months.
OK, now I'm missing your point. Jobs was out in March '85 when Sculley foiled his failed coup and subsequently stripped him of all duties. The fact Jobs didn't submit his official resignation until September was a technicality, he was already mentally and emotionally out of there, if not physically in an empty office building on the outskirts of the Apple campus. Of course the Plus case and analogue board is the exact same design as the 128 & 512 and the 512K was released in just about the same window from the 128K as the Plus from Jobs being stripped of duties. Either way, adding a fan to that case is a no brainer and as Aoresteen points out, internal upgrades were readily available by third party suppliers with no modifications required. As I pointed out, the analogue board was modified in 86 after the Plus was already released. Sticking a fan in the case at that time even would have been no more difficult for Apple than third party vendors. In fact it would have been easier. Also, Sculley asked Frogdesign to update the Mac Plus case just before the release – this was done completely without Jobs participation and eliminated features that Manock had designed and Jobs had previously approved. So in Jobs' absence, engineering a simple fan for the Plus release would have not been a problem either. So there must have been other factors.
