Agreed. It shouldn't be necessary to remove content unless it is problematic, outdated, or just unneeded. .NET Magazine moved some of its online content to Creative Bloq, but left out much of the existing content. I know I've bookmarked a number of articles from the former's website, so will have to look for those and update them if possible. Fortunately I've for some time used Evernote to clip and archive useful web content for later reference, just in case. This may well not be the case for the larger web however, though the Web Archive may be of some help.