I would suggest that conversions might require a reasonable amount of understanding and tinkering during the conversion and testing process. However once I put the engine in an airframe it is seldom if ever touched again.

If however one has difficulty sorting out glow engine problems they are also likely to have some difficulty with gas engines. Gas engines of all types are more likely to be set and forget. In that context gas engines are more reliable than glow engines.

If you don’t like engines don’t attempt conversion. It is considered macho to purchase an ARF engine but not macho to purchase an ARF airplane. Go figure.

Bill