The lack of process is all in the details, and it varies by jurisdiction. If you have a red flag law that requires a sworn statement with a penalty for lying, is actually temporary, is actually of a short duration, AND automatically returns the firearms when it expires or is terminated, then you are pretty close to something that deals with a serious problem with sufficient respect for the due process rights of the respondent. As long as gun rights are not terminated, or the guns permanently withheld, or the respondent has to actively litigate their return ($$$$$$$), then it may be alright.
Most ERPO states do not work that way. The liberty and property rights are divested without an opportunity to be heard, and then the litigation that ensues is a circus. Very tough.
And there are places where it is extremely easy to get a temporary observation in place. In PA, for example, all you have to do is have a doctor sign a form and you can be held for up to five days. Your Second Amendment rights also happen to be terminated permanently at that point. You can have your firearms and ability to use them restored by legislative grace, but the actual right ceases to exist.