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As married couples you may choose to share things with your partner like joint savings acount and also contribute for some projects together like building project but having a joint Bitcoin wallet should not be encouraged. Aside running away with the funds, if your partner carelessly exposes the private keys or seed phrase, you're screwed. If both of you want to invest in Bitcoin, do it separately, not everything are meant to be shared.
it is true that it's not everything that should be shared. i have also read through the conversation and i have gotten some clear pictures on how things should be done.
even for security consciousness, couples could be encouraged to have 2/2 multi signature wallet. when hacker or a scammer knocks, both of them has to be convinced before the transaction will be signed. this will make it even more difficult for them to be scammed.