Sure, it's going to take longer to get a level of mastery to which many long time D&D players will be accustomed. But it shouldn't take long at all for people to get the gist and have a sense of whether a game is worthwhile or not. It took my group one session to have a good grasp of the Alien RPG. Did we mess up a couple of things? Sure. Were there any rules that we skipped initially? One or two. But we got the core mechanics, and we got the mounting sense of dread as our PCs accumulated Stress and needed to make Panic rolls.
Also, most games are not as complex as D&D. I know we think of it as easy....especially 5E....but there's quite a bit to it. Many other games are much simpler and don't require the amount of time to learn.
In 13th Age, montages are a pretty straightforward idea. But most of our group thought they were pretty awkward feeling the first time we did them. I'm not sure someone who is uncomfortable with them the first time can make an honest judgement of how they feel about it until they've had time to get into the groove with it. I assume some other games have similar things where there is a shift in narration and control.

13th Sage: More Uses for Montages
Montages—first introduced in our organized play adventures and later expanded on in the 13th Age Game Master's Resource Book—can quickly advance a story whi
