It’s not a matter of convincing. At this stage, some people will find value in the new V3 app, some will not. Eventually everyone will have to use it because the V2 classic App will go away.
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some devices only work with the V3 app. That includes high-end Samsung smart televisions and appliances, but also some of the newer official integrations. I believe the new TP Kasa integration is one of these.
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The V3 app has a much better built-in rules engine than the V2 app. If you are using webcore, you probably don’t care, but it does make a difference to some people.
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there is a community thread where people write about what they like better about the new app:
Things I like BETTER about the new app vs Classic
But if you like the V2 classic app better now, you can continue to use it until it goes away.