It usually means:

• More adjustments
• More moving parts
• A higher price

Most people make the same mistake, they judge a chair in the first 10 minutes. Almost any chair feels fine at first, the difference shows up later:

You need a chair that:

• supports you properly
• stays comfortable over time
• doesn’t require constant adjustment

Are ergonomic chairs worth it? They can be — but only if you actually benefit from the adjustability.
Is a cheaper ergonomic chair a good option? Not always. At lower prices, build quality and support tend to drop off quickly.
What matters more — features or comfort? Comfort over time. Features only matter if they improve that.