Almost all computer games are mostly real-time.
Some consider real-time simulations to be more realistic, engaging, and educational.
- They are more realistic because many "real-life" target situations, from flying to negotiating, are real time, and so that dimension is a critical part of it. They also create pressure which mimics the pressure found in situations that aren't inherently speed-based.
- They are more engaging, in that they require intense awareness, and the constant requirement to deal with surprising situations. They also might prevent people from over-analyzing.
- They are educational, but also because they make it easier to see fluid patterns play out.
It is finally worth noting that real-time is not synonymous with twitch-speed. A good real-time simulation, unlike a twitch-game, could still be of significant educational value if played turned-based.