It also depends on what the information you check out is, and how far into the process you do it. I always understood the point of Chareidim checking out before was not to avoid breaking it up later but rather to avoid wasting time, emotional energy, etc. dating if is not going to work out. (In other words, if this information would break of the shidduch after a few dates, why would you not want to know it before hand and avoiding the unnecessary dating altogether?)
BTW Dor Yeshorim themselves requests VERY STRONGLY that you check out before the first date so as to avoid any uncomfortable situations later. It is literally a 5 minute phone call, so yes, even if you are on girl #376, there is no reason not to make this one call!