Re: Newton fishing
Newton was first spun out into a standalone subsidiary of Apple, called Newton, Inc (Claris was similarly split out); later, it was "spun-in" to Apple again, mainly so that Jobs could shut it down.
Newton's last product line was "eMate" a small laptop form-factor aimed at the US school market (and a forerunner of the design language that would appear with PowerBookG3/iMac/iBook). It did okay, and looked like opening a new market, but maybe someone in Apple saw it as a threat to Apple's own, higher margin, computer sales into that market.
But the big benefit of Newton was the investment in ARM Holdings. There were only two things that kept the company running through 1997: income from the ARM shares and the $400M settlement/investment from Microsoft.
I briefly worked on the "Tanzania" 4400-series PowerMacs - I wouldn't class it as a failure, though. By the standards of the time, it actually sold well. More importantly, it provided a lot of experience about reducing Apple's dependence on expensive components, particularly its reliance on SCSI for mass-storage; a year later, iMac arrived, with many of the same PC-parts-bin bits inside, just in a fancier case.
The hardware "failures" had all occurred before the likes of the 4400 came out. The real damage to Apple was done by the bewildering "Performa" range, where some were decent, and others were complete dogs, and even people inside Apple had trouble remembering which was which.