Jain Dharma does not see its मूल सिद्धांत as “old-fashioned teachings,” but as timeless principles based on the nature of soul, karma, and liberation.

In Jain view:

• Ahimsa is not a temporary rule; it is an eternal ethical truth.
• Aparigraha, Satya, Asteya, and Brahmacharya are also seen as universal disciplines for purification of the soul.
• The purpose of Jain teachings is moksha, not changing with every shift in worldly trends.

At the same time, Jainism is not against knowledge or reasoning. Jain tradition values:

• anekantavada — many-sided understanding,
• syadvada — careful, conditional statement of truth,
• pramana — valid knowledge.

So Jainism does not reject “new findings” just because they are new. Rather, it asks:

• Does this support truth?
• Does this reduce violence?
• Does this help in self-restraint and karma-bhavana?
• Does this lead toward spiritual upliftment?

If some outer customs look irrelevant today, it may be because people sometimes keep the form without understanding the spirit. Jain Dharma itself emphasizes understanding the inner meaning.

So the Jain answer is: The core truth does not need to be updated, but our understanding and application should be deeper, clearer, and more aligned with the principle of dharma.

If you want, I can also explain this from the angle of anekantavada or why Jain ethics still remain relevant in modern life.