Without arguments is it likely a relationship will flourish and progress?

If you're 5-6 months in your relationship and neither of you had any major argument (no yelling matches nor anyone feeling unheard) nor unwanted drama then is likely that relationship will flourish and progress?
Is that how a relationship that's likely to progress than get stuck or end in a break-up looks like?

Note: Both families (the woman's and man's parents) like the partner since day 1. They approve the relationship.
Secondly the woman isn't the nagging type either and finds yelling in a relationship and throwing insults very rude.
Yes
No
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Neither of them like it when couples insult one another. Just like her, he finds that also rude and disrespectful. A discussion needs to be solved and should never lead to an out-of control argument with yelling matches.
Without arguments is it likely a relationship will flourish and progress?
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