I coached at an indoor golfing centre down in Australia many years ago and I must admit I enjoyed the experience.
From a coach's perspective, it's great because of the perfect conditions whereby, heat, wind, darkness, rain or snow, together with video issues are not a problem.
From the customers' view point, you pretty much always have a perfect lie, and you can just pick a "target" and swing away.
On an actual golf course, you almost never do.
Even teeing areas aren't always perfectly level, and even if all 18 tees are, that's only a quarter of your shots, assuming you're shooting par -- which most golfers are not.
It's a perfect environment to learn swing basics but lacking in most indoor games is their course management.
How often in these indoor places are you going to practise a low punch cut under a tree and around a bunker?
Indoor practice -- or even on a driving range -- is not going to make you a good player. Nothing equals getting out and playing.
It would be amiss of me not to mention how disappointed I was to reach out to a local Bangkok indoor learning centre and not to receive back any answers to any of my basic questions.
Unfortunately, this experience only underlines the importance of asking questions, for example, are the qualifications of your designated coach recognised?
Out of Bounds: I ended up on national television when I was hit in a very tender part of my anatomy when coaching a student indoors. It was filmed and with much glee from my colleagues, they sent the clip to a TV channel and my squeals of pain were made audible Australia wide.