Many would say that the FOSS alternatives don't copy Office enough. Often, by going there own way with various tasks, they create a bigger jump. Case in point, the Linux distros that attract the most attention for common folk and not niche use, are the ones that are more Windows-like. Examples: Linux Mint, Ubuntu, Zorin, etc... The smaller the jump, the more you can convince people to switch over.

When there is a significant difference, it needs to be shown what the equivalent is in the alternative. The jump can be a bit mitigated by education or information, but usually by only so much, where it's still seen as attractive.

I think the main issue for most people is that the layout is slightly different, probably to help prevent microsoft from suing them.

But once you get used to those differences, (also, knowing that there are a handful of themes that can shorten the difference significantly) then it becomes a non-issue after less than 10 hours of use.