You mean like pre-built toolboxes have some tools many people don't really want? Good thing people can choose the toolboxes they find the most ideal, even if it contains only a hammer and a duct type and a lot of empty space, isn't it? :)

When Opera switched from Presto to Chromium, it was about as fast, but it was much lighter. Yet, almost every Opera fan/"customer" at the time was pretty mad. It was not because they were attached to Presto, but because of the huge feature depreciation. It's the features what made people use Opera until its 12th iteration, and some even use it today despite it having huge issues chewing through the bloat of JS on some sites.