In the third game of a best of three match when one team reaches 5 points the players switch ends and a different player receives the serve. It is not a tactical decision, it is required by the rules.
The Laws of Table Tennis
2.13.6 — The player or pair serving first in a game shall receive first in the next game of the match and in the last possible game of a doubles match the pair due to receive next shall change their order of receiving when first one pair scores 5 points.
2.13.7 — The player or pair starting at one end in a game shall start at the other end in the next game of the match and in the last possible game of a match the players or pairs shall change ends when first one player or pair scores 5 points.