Is this game still relevant?
I'll try to put my thoughts in order. Bear with me!
I've read the manual from the first page to the last. I enjoy the Monster Vault a lot, all the monsters have a "flavourful" attack that really elevates the design, clearly, above D&D. Even above 5.5e, in my opinion.
I really love this "flavour of 5e rules".
But after the release of 5.5e, I wonder if TotV is still relevant.
I wonder in fact, if Kobold Press itself thinks it still relevant, and if they will continue to evolve and create sourcebooks for it.
I say this because I loved the book, but if I go to Kobold Press right now, I see they created a monster manual revamp for 5.5e. I really think KP would create materials exclusive to their game if they thought they still have a chance against 5.5e or if they thought they have more to offer in a different direction.
This project was born as a reaction to Wizards being an ass about third party content. Now, as they've put their two recent editions under a Creative Commons license, I wonder if KP has settled on keep releasing content for 5e and 5.5e and return to their main and prior business.
Is it worth to invest in this game still?
PD: I hate that it seems the Spanish publisher for TotV is not translating the new books. The Player Guide 2 finally introduces new original classes that differentiate the game more from 5e and they've seemed to stop. I'm able to play in English but the translation was good and the physical copies are gorgeous. They didn't even release the GM manual, only the Player Guide 1 and the Monster Vault.