Serie A, which has quite a long holiday for players and this should give new energy and enthusiasm after a long period of time can be used to rest.
Many leagues have long holidays for Christmas and New year which are important in Western nations. England do different things than others so let them be. Generally most of leagues have 20 clubs and same total rounds (39 rounds) so only Premier League decide to do tough tournament in New year time in order to satisfy fans and get more income from television rights, etc.
It can bring side effects for their national team which comes to big tournaments (World Cup, Euro) with exhausted physical fitness. They should change this strategy but if they don't, let them be.
These two big games the four clubs definitely expect to get 3 points but my prediction is Milan and Juventus will win, I prefer to bet on BTTS in these two matches or over 2.5.
It will make the race for Scudetto and top 4 in Serie A become more interesting. Napoli, Atalanta are falling down and Juventus are rising to replace them in top 4. AC Milan will try to fight tightly with Inter Milan for Scudetto.