^^^ I agree, Euroka1 - the disruption causes inconvenience at the very least, for all concerned. No matter how experienced the player, the interference with momentum ./ focus could be detrimental. It can't be conducive to best performance when players don't know if they will play or not, and in this regard I agree with those who advocate better preparation by the tournaments. But these are outdoor events. I'd prefer to see sensible changes to the schedule to accommodate bad weather, than rooves built only on some courts.
Friends of mine who are in NY for the USO have had to re-organise their plans in order to ensure they can get to see the players they want to see play, & had to incur extra expense as a result. It hits at every level.
The next tournaments I am planning to go to are Paris - Bercy & the WTF in London. Both indoors, so I won't be packing my umbrella!!
Anyway, for what it's worth given the weather, here is today's draw:

I'm not alone!!!!
I hate indoor events! The last thing I want to see is another roof. No one has been more impacted by rain the last few years than me. This year, Monday was a wash for me because The Weather Channel got the forecast all wrong. So when I left the tennis center, I didn't return as T-storms were forecast to resume at 4:15pm. They never came, but I had gone to Manhattan.
Last year I was at the Open for 3 days and 2 got completely washed out due to rain.
The year before, 1 day completely washed out. And again the year prior to that.
Now, from a spectator's point of view, I don't mind one day of rain early in the first week because they make up matches the next day and put superstars on smaller venues. I got to watch Murray in the front row of the Grandstand this way because his match had to be moved from Ashe to accommodate higher ranked men and women.

Rain wreaked havoc with 2008 RG and I watched just 7 matches in 4 days. That sucked. Good thing I was in Paris!