I would say the Philips CD-i. They designed the console with a slower clocked 68000 processor, had to put the machine on the backburner for a bit of time, then brought it to market with that slower processor even though newer, faster versions were being produced. If I recall, a lot of people at Philips were against that, thinking they needed up-to-date hardware to compete. Which turned out to be true. And they only focused on games closer to the end of its commercial life, which put them deeper in a hole since the hardware was painfully underpowered compared to the competition.