Yes. According to a few SEO expert's opinions that I have found, long-tail keywords need to be exact.
However, you should also focus on writing useful content that ranks for long-tail keywords.
As always, it's best to test out different long-tail keywords and see which ones perform best for your specific product.
Pro-Tip: Prior to developing content, be careful to research keyword search volume and level of keyword competition.
P.S:
You are currently on the Digital Marketing Forum page; for more information on various topics that may be helpful, please visit Blog Posts (button below) and share any content post you love with your network.
[If you have any specific questions in mind, please drop a mail and I will answer through a post at the earliest possible time]. Check this forum frequently for fresh posts.