It's not impossible, but it's certainly trickier. You'd have to save plenty of fuel to kick back into the atmosphere and land, re-entry is much more strenuous,

It's not impossible, but it's certainly trickier. You'd have to save plenty of fuel to kick back into the atmosphere and land, re-entry is much more strenuous, and you'd have to complete a full orbit to land back where you launched. Nothing is a showstopper, but it would take development.