[christopherslee]

I agree with this point. It's hard to know if the OP is talking about title progression, or growth in the same role. Without knowing your organization, I can't say whether or not people are perceiving growth as having to take on management responsibilities?

If we're talking about growth as individual contributor, above comment is on the mark. There are still ways to grow as an engineer. Broader knowledge, deeper knowledge, reflecting on how to improve things, how to better connect the work to customers and the business, etc.

But, as their manager, you can help them tease it apart potentially even advocating for changes to the IC/technical track within the company?