#3 Sufficient rest for players as Arsenal lack squad depth
The fact that Arsenal are clearly the weakest team on paper in the 'Big Six' of the Premier League is an open secret in England. They do not have an appropriate squad depth and the Gunners have a reputation of buying players who lack bones.
In other words, Arsenal has suffered terribly due to injuries over the years, and that needs to be fixed. Players like Jack Wilshere, Alex Oxlade, Koscielny, Kolasinac, Monreal, Danny Welbeck, etc have been injury-prone players and have cost the team pretty much.
The outstation tour will help players to take a break from the cold London weather and freshen up for the last phase of the season. Arsenal's two main forwards, Ozil and Lacazette, have traveled with the other 21 players. Ozil's consistency and dedication in recent weeks have earned him a fixed starting spot and Emery would certainly rely on him to lead the team to glory by the end of the season.