noticed there is no house wrap on my 20 yr. home - how concerned should i be

i have a 20 yr old rancher in pretty good shape overall. Recently i noticed there is no house wrap or tyvek under the vinyl siding. I also have recently had the interior painted with new drywall tape. The drywall tape is coming off after only a few months. How concerned should i be regarding the absence of house wrap and is it possible that this is related to the drywall tape not staying adhered.
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Zeb

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