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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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DMARC on ProtonMail custom domain

I began using ProtonMail email service, I like it that much, that I connected my domain yesterday and did appropriate changes to DNS. This page of ProtonMail's knowledgebase says how DMARC shall be ...