I really cannot comment on the game, as I didn't see it, and can only go by the comments above.
I did watch a great game last night between Chateauroux and Cholet, which the home team won 2-0. The coach in his after match comments said, "J’ai le sentiment d’un vrai collectif. Mes joueurs travaillent les uns avec les autres, les uns pour les autres ! Tout le monde doit travailler et c’est ce qu’ils font." Translated, it is this more or less. "I have the feeling of a real collective. My players work with each other, for each other! Everyone has to work and that's what they do."
This coach, who has only been in post since the start of the year, has stamped a different style of play on the team, dropped players who seemed to get an automatic start, and brought in three or four youngsters from the youth team. The set up through the club gives young players the chance to progress, and apart from one or two, they are happy to stay and win a place in the team.
So I suspect that because of the frequent comings and goings of managers, players do not have this feeling of being part of a "real collective". Some will be in favour with one, but not the next one. Unlike here, the chance of progressing from an 8 year old to the first team are not good. Either they are lured away by more money, or they do well with the youth team, and then find they get a game in the next stage if there isn't a trialist or first team player recovering from injury that needs a game.
Watford has become a club where only the first team seems to matter, but not a "club" any more, where good young players get a clear pathway to a place in the side. We can buy a side is something that only the big clubs can afford today, and Watford is not big enough to do that. Someone within Watford should take a look at the whole set up, from the very youngest to the first team, and develop a plan that brings the club together, not a series of different parts.