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Soft-fail vs Hard-fail SPF + Monitor vs Reject+Strict DMARC, could it be counterproductive?

I have a ProtonMail premium plan with one custom domain and a single email address. My domain DNS is protected with DNSSEC. What caught my eye were two things they recommended in the domain setup: ...
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Is it bad to use DKIM DNS without signing mails?

Does it provide any trust at all to have DKIM set up correctly in my DNS but not sign any emails? I could not find any information about that. Now, if I send an email to a domain/server with DMARC ...