Few things and my personal take on it. I normally ask these questions with myself:
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Yes, it is true, there is no sin in leaving sunnah and nawaafil salaah, but in offering them, what are we getting?
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Did Prophet:saw2: ever left sunnah Mo’akkidah? If he did not, what justification will be bigger than his actions? hmmm
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There is a famous hadeeth that on the day of judgement, the nawaafil and sunnah will make up for our missing fardh salaah… my reflections:
– If we consider ourselves pious enough and have not missed out any salah in all our life or we think we will never miss out any salah in the future, by all means, just offer fardh… no harm doing it, or is there any?
– If we think our Faraaidh salaah are good enough and accepted enough for us on the day of judgement (when the first question will be asked about salah), then, are our faraaidh carry more weight than the salah offered by Prophet:saw2: that he offered sunnah and nawaafil? If you think so, go ahead, pray only faraaidh, that should be enough…
Remember, Offering salah comes under Huqooq-ullah … which Allah may forgive on His consent… but there is no guarantee.. only a hope and a chance… Are we concerned about Huqooq-ul-Ibaad? Which will be forgiven only if the person forgives whose right we might have violated? Do we try to find out what they are?
These are the questions we should be rather worry about IMO.