If it was truly a frivolous suit sanctions would be awarded. But either it isn't a truly frivolous suit, or it is your imaginings running wild again.
You say that.
But you don't know.
Legal costs are rarely won. I know of only 2 here.
One was a landlord defendant. The other was a tree service plaintiff.
Neither was able to collect.
I say that plaintiff's should also have to post a bond to file suit, just in case they have to pay damages to the defendant.
A truly frivolous suit would be easy to dismiss, you could write the motion yourself. You have quoted your attorney before noting that you could have a slam dunk case, take it to court, and win 90% of the time. This is true. But it is not dealing with frivolous suits. Worse still, the type of plaintiff with whom you have likely struggled is not going to end up paying you anything. There is a good chance they are judgment proof. But I would also like to note that if you are as experienced in law as you represent from your tenure as a landlord, there is a good chance that all those suits are not frivolous at all.
Again, you simply don't know.
I've even dealt with a couple pros, whose sole business was filing
such suits against businesses they come in contact with. They're well
known in the community, & yet there are no sanctions against them.
Your "fib" accusation bespeaks an uninformed need to believe otherwise.