Not an apple fan really at all but buying that chip design company way back when seems to have been the right move. The M1 chip in my mbp is fantastic.
Even before that, Apple owes its very existence to an acquisition. Acquiring Next allowed them to abandon their dying OS and start anew with OS X, and brought back in founder Steve Jobs (who Apple had previously fired). With Steve Jobs at the helm, they made the computers cool again to buy some time before the iPod completely turned the company around.