In England we can get bad weather anywhere between November and April on a non-predictable basis, so when would you have a mid season break?
Just takes squad planning. Some rugby sides go all out on a strong first team and have to use academy players during internationals whilst others go for a larger number of less well known players. Keeps the league more even
The main reason they are talking about a mid-season break is:-
A. To prevent injuries.
B. To prevent fatigue.
C. To help England do better to win tournaments.
Not due to the weather.