I have to wonder how much investing in some of today's tech behemoths comes down to viewing them more as a holding company / investment firm and less about their original core products. Microsoft has lost tons of desktop share over the last decade, this should have been a death signal for them but instead amazing acquisitions like Mojang, GitHub, ActBliz have pushed them to an amazing market cap. Similar with FB loosing use as a social media platform but staying in business with Instagram/WeChat etc.