For us, it is not a big deal. I have generally been able to get what we want, though we don't do as many TS as we once did. The food quality/pricing have both gotten so out of hand, TS dining just isn't as appealing as it once was. Our most recent ADR, the food was just so-so. My pasta was mushy. As usual, the 'vegetables' were only garnishes, not what I would call an actual serving of vegetables. We also waited a solid 15minutes to be seated, even though the restaurant was less than 50% full. My companions' meat was decent.
FYI, I also had a online order completely disappear, even though the screen showed a confirmation code. I never got the email. The restaurant had no record of my order. They did believe I placed it, so I think it is a known issue. On top of that, when I went to re-do the order, WDW was having a property-wide problem with gift cards. If anyone tried to use a gift card, the gift card came up as having a zero balance. When I went to redo the order, this happened. So I had to use a credit card. It was doubly annoying. All day, we were unable to use gift cards to buy anything, and it was our last day, so we did not have the option of buying items another day.
This leaves me even less eager to dine on Disney property.
So that is mostly my solution. If I want any hard-to-get dining, we plan it for the day we have best odds. If we have a split stay, I book it on the last day of our longest stay.
One positive is that
MDE now shows a wider range of availability of the days you choose. (not just 1-2pm. but all lunch openings for that day.)