I'll share my personal use of twitch streams. I really enjoy AOE2. The game might be nearing its second decade, but its very enjoyable for me to watch personally. I will use youtube-dl to grab past broadcasts and play the games back at 1.5x to 2x speed. I can easily skip through parts I find uninteresting. I'll generally watch one or two games per day, but my time commitment is under 30mins.