I’d need further examples to know for sure if my “solution” (following shortly) is applicable across all the exemplars you might mention. I should hit some of them, at least.
I’d turn chiefly to the emphases that Holy Writ itself puts on Topic A over against Topic B. Your example is “promoting marriage” over against “affirming the value of single people.” I’m don’t think these are precisely topics of differing emphasis, but at least in this case, I’d agree that debates about the relative weight one merits over the other is a debate I’ve run across for a very long time, at least back to my own university days, 40 years ago!
So, into such a debate I’d raise this question: which of the two might one find Scripture (as a whole - Genesis to Revelation) giving to these agendas? Which of the two - affirming value of single people, promoting marriage - gets a bigger exposure, a heavier emphasis - in Holy Writ?
Even to answer this question could generate a profitable (and, likely, a lively) discussion.
As you volunteered that you’re in Scotland, I’ll report that from my perspective (broadly evangelical American Protestantism), affirming the value of single people has gotten way more emphasis for the past 40 years than promoting marriage.
As a single seminarian in the 1970s, all the church ministries I visited (including my mother church in a university town) had gigantic “singles ministries.” Sometimes these were sort of inevitable - by far, most university students are single. But so far as I could tell (and I looked!) there was nothing in these churches’ programming aimed at young married couples, much less married couples qua married couples. Maybe there’d be a “marriage enrichment” seminar once in a while. But, that’s it. And, never did I find a ministry where older women were deployed in ministry toward younger wives (or young potential wives) in a way Paul mandates in Titus 2.
So as I hold up Genesis to Revelation in one hand and the usual church ministerial programming in the other hand and compare them, it would appear to me that “affirming the value of single people” is WAY OVEREMPHASIZED and promoting marriages is virtually ignored.