Why are they removed/replaced? With them one can navigate through the games with one click.
It was mentioned that the infobox was starting to become too long and so the seriesboxes were deemed to be removed when they are replaced by the new taxonomy rows that also includes the seriesname.
The team is aware of the downside of this though and we're currently discussing adding an automated check that will automatically add the seriesbox below the infobox again with either an expanded state (basically the same as before) or a collapsed state (like how the seriesbox worked on mobile devices). It would basically calculate how many rows a seriesbox included and if it was found to be too many (something like 10 or more), it would collapse the section.
We currently have no estimation though when this might be implemented.
Sounds good to me.