That's the core issue.
We shouldn't let firms dictate ownership. Buying stuff is historically a right to property. The whole discussion is pointless because digital firms are using the regulatory capture, its slow reaction and legal loopholes to dictate ownership, all while doing PPP with the gov and lobbying for its causes.
This whole thing is a temporary theater show (while we discuss the issue, the firms are making money and donating it). People should DEMAND regulatory instruments to react quicker and respect our rights.
This is especially bad for the authors in case of content based product. If you are selling copies of knowledge you acquired then forcing you to allow reselling means you will have to sell for much higher price or not at all. There are opinions and verdicts of EU courts which makes different rules for content based electronic goods. For example you are not forced to grant refunds with those. I really hope Steam wins the appeal or that courts in other countries won't repeat this verdict (it's not case law in most of Europe so what French court decided hasn't much weight in Germany or Poland or whatever other country.
The author also doesn't control your life, quite the contrary the court wants to control the life of the author by forcing them to implement ways to move the game to another person/computer/account.
I think selling a computer where the game is installed to someone else is more akin to selling a book or a car or whatever and I doubt anyone would oppose that.
The author's problem are entirely self inflicted in this case, as it is his own DRM that is making him do extra work to allow transfers.