And, if they can be changed, do you agree they should be?
Of course it should be.
Specifically, should one woman be allowed to be a witness without another woman as another witness?
Rationally, it would depend on a lot of things. This was not considered as "allowed" first of all. This is the way you have perceived because of propaganda. Islamic law came way, way, way before any of the ahadith were ever written down on this matter. There is one hadith from Bukhari's kuthub as sahih. That hadith speaks of women having half the value in testimony. This was narrated ultimately (apparently) after Bukhari died, by his unvouched for (In islamic tradition someone has to vouch for someone elses scholarship) student called Firabry. And the manuscript tradition dates to approximately the 14th century which is 700 years after Muhammed. Anyway, it is predominantly Christian evangelists who demonised this and you have inherited that. No doubt.
No one said "women are not allowed". It is the person who signs the contract who is told to get two women as witnesses if not one man. So saying "it is not allowed" is a twist in it. Of course, you will not accept it.
So the idea is that women and men are equal in Gods eyes. But they have differences biologically and sociologically. You will of course look at it from where ever you are. And in the future, maybe they will have a machine to take care of the child, maybe they will have other highly superior technology where you won't even have to step out of the house to vote. Maybe they will develop surrogate robots to represent you in courts. Well, in that case, this law is unnecessary.
At the moment if you go to lets say a place in Asia where in a village a mother gives birth at home or at the local government funded hospital. Then she gets 4 to 5 months maternity leave. The father if he is employed or is a farmer or a businessman will have no choice but to go to work. The mother has no choice but to stay at home. Baby has to be fed 10 or 12 times a day. They will not use diapers because it is not something they use. It is not in their culture. They will have a white cloth they will tie around the baby like a napkin folded in the form of a panty. They will have them washed by hand and hung on a line all over their backyard. It is a very very common problem when there is a court case, the woman is unable to make it. It is very very common. Just that some people in the city of high rise cannot empathise with this because their perspective is very limited.
So yes. These kind of laws can, and must change.