Interesting this topic that you have chosen today, dear friend @crypto.piotr.

The conformation of tribes would allow Steemit users to access a specific content trend, where it is assumed that the publications would facilitate the attention of a qualified audience that could better appreciate it and contribute valuable feedback, rather than being accessed by simple users "curious" that perhaps would not add value to the development of the subject.

Being able to support more strongly the content creators of a tribe with a particular token would be at first sight a useful function. Since it would serve for growth and greater influence (power) within the niche or tribe.

Generally utility tokens fulfill a specific function within an escosystem and allow access to advantages or privileges.

So far the tokens in Steem-Engine only allow you to increase your "steem power" within the tribe. I have not seen any other application so far, so its useful feature is very limited.

Then maybe we should see them as security tokens as they are interchangeable in internal DEX. What would allow the investment and get ROI.

Maybe they are hybrid tokens?