Had on a sneaking suspicion that it might be the case. I noticed that they changed php detection algorithm at some point and added 5.6 support; thought that latest version might might also be friends with PHP7 but apparently I was wrong.
I know, I run currently several Magento installations on PHP7. However it's still workaround, which is not good as PHP7 has been "latest" PHP for several months and ISP-s start using it as a default version.
Anyway, people keep asking from me about PHP7 and they made me wonder if any of those small patches we saw lately did something about it ...
The Inchoo extension is a great starting point, however as others have stated it is a work in progress.
I do run M1 on a PHP 5.6 instance and will randomly find a issue here or there. The step up to PHP 7 will probably include even more workarounds. If you do use PHP7, I would recommend you contribute to the Inchoo github page.
If you don't have root to run a patch or would prefer to patch Magento manually, this post will help you to make Magento work with PHP7