The thing is....there are probably many like me, who never saw Wayne Northrop as Roman, nor Josh Taylor as Chris Kositchek. And I have been watching over 30 yrs. I did see Drake Hogestyn portraying Roman, at least everyone thought he was Roman, until Josh Taylor as Roman showed up. (funny thing was their body build which is nothing alike, yet no one mentioned it then). Anyway, Drake Hogestyn became John Black, and that is who he is, Josh Taylor is Roman.........to a great many viewers.
These days, it is difficult at times to recast, tho it is still done. Sometimes success (EJ, Kristen for instance) but long timers like Caroline & Shawn Brady, Victor K., Stefano DiMera, just seem unreplaceable. The show has not even attempted to recast Bo, Hope, Sami, Carrie.....when the actors who have played them so long decided to opt out for other pursuits. The younger actors seem easier to recast perhaps. Wish I had a birdie behind the scenes who might shed some light on the decisions, but.......oh, well.