Yeah, I agree from a business perspective, Harry Potter was the right move that ushered in a new golden age for Universal...but at the same time, I also agree that IOA lost a lot of its soul when Merlinwood/Lost Continent got taken out back. Such is especially the case with Dueling Dragons, it absolutely made sense to retire it in its state as of 2017, but I was still really sad to see it go and get demolished like that, in its prime it was such a unique and iconic attraction and it felt like the first major loss IOA had in its years of operation.
Definitely feels like Universal Creative know that they lost something special there, that's why they've been making all of these tributes to it like the HHN house and even creating an all new dueling/racing coaster at Epic Universe as sort of a successor to it.