Because, given the current situation of anyone testing positive, or having been around anyone who tests positive, needing to isolate for 14 days, that immediately wipes out squads of players. 80% of let’s call them 40 man squads (players plus coaches and physios etc) are believed to become infected over time. If only one player is infected, but the whole squad has to isolate for 14 days, no game can be played. 2 weeks later, the squad returns, symptom free, but the next day one more squad member tests positive, the whole 14 days begins again- hence no games.
This is just a potential scenario for 1 squad, and you have to time all being ‘clear’ with the opposition!
Players share changing rooms, gyms, showers, canteens etc etc
I just don’t see a plausible way of playing games in the current climate.