Party base with develloped companions in the curent D&D installement of the tabletop is probably ok to everyone I guess...
What you describe is only a vision one can have for its game... Not the feelings players will experience. A party base game with 3 companions out of 5 possibilities (+ horrible creature, owlbear cub or spiders) seems a little bit contradictoire to me, especially when one is a vampire, one is named Shadowheart and one is a Gythianki.
I guess if many more were planned they would have say it.