I'm not sure you can totally blame the club here. They may have found that the main problem was "user errors" rather than the infrastructure. If that's the case then there's no real need to do ramped up stress testing because that's already been done at other stadia, it works, that's known.
The other issue is how do you organise these test events? The pandemic has stopped the club doing any pre-season games with fans, so far. Maybe they will still try with restricted attendances but personally I think we just have to go with it. I know it's not welcomed by many, but I understand the reasons why it's being done, and actually can also see the argument for doing it now rather than deferring it another year (when there may be a naturally lower attendance early on).
In the grand scheme of things, it's a first world problem we are facing. I'm happy to put up with the inconvenience (and will probably moan about it afterwards) but after what some people have had to face over the last 18 months, I'm sure I can handle it.