Thank you for your time to read the above reply. Here are my responses
4. Regarding Hugo, I don’t think so. This might help on this topic: https://github.com/GetPublii/Publii/issues/601
5. “two posts side by side on one page“. – This would mean 2 posts side by side on one POST ( as a page is technically a post in publii). So, even in WordPress, this is not possible as far as I know. But if you talk about two Blocks side by side, it is possible ( example: https://oxlin.io/contact-us.html)
7. Mega Menu – No. I asked Bob while I was evaluating Publii, he confirmed it. I think they want to keep the app as simple as possible.
8. I have used Gatsby in the past and most of them use Netlify form submission, or some third party (https://itnext.io/a-comparison-of-static-form-providers-2adc51c87053). Without using a third party solution, I am not sure.
Hope my responses help you.
Good luck for your project 🙂