It can be kind of a PIA, but it is possible to have a strategy export data to a text file. With some experimentation/trial-and-error, one could export exactly the information needed and just open it in Excel, or massage it once in Excel, and save any needed formulas to streamline the analysis.
Not sure anyone on this forum would have thousands of systems, though I can imagine hundreds. Kevin Davies, who does only automated trading and conducts classes in their development and, presumably, uses any decent systems his students create in class, says he's only running about 90.
My own systems export data for later analysis, though nothing post-exit. It'd be easy to do, though, if you set a limit on the number of bars to look at post-exit.