I found solasta to not be faithful to 5thed as 5thed emphasizes RP and creative solutions, it's why a lot of the rules where compressed from 3.5, but when all you have is just combat (yes the combat is faithful) then even thou it is faithful it really is not faithful, as the spirit of 5th ed is missing in its entirety. Solasta gives you no agency at all, you get teleported as a party for most fights so no tactical anything, choices do not matter, and there is almost zero tactical play in Solasta beyond, drag a wall of fire with 2 casters and watch everything die as the brain dead AI just runs through it
