To be perfectly honest you don't even need...
you use power setting, such as fuel flow for one, to maintain target airspeeds and sink rates for any given aircraft configurations.
Let's move it on a step and lose all the engine instruments as well. All you've got now is some throttles, a control column and a window.
Now we're flying. Look at your landing point, fly towards it, configure, don't stall. Easy.
Yes, you may not be at the 'correct speed' or the 'correct approach angle' or the 'correct rate of descent' etc. but do we really care about that at the moment?!
Edit to add that there are now some airliners that aren't flown with reference to power settings and fuel flows and things like that. A simple energy trend and acceleration vector is what they use. Doesn't lead to people learning and remembering power settings and the like.