I think the response to Alden Ehrenreich as Han Solo led to Disney/Lucasfilm becoming more adverse to recasting (particularly Harrison Ford in Dial of Density, despite the history of multiple Indiana Jones actors!)

It's a pre-Solo thing though, in that the weird 'we slathered hundreds of pounds of make-up and CGI on Hayley Atwell instead of just casting an old person' is 2014.