iPad screen protection
Do the newest iPads need to use screen protection
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iPad screens are robust, but the anti-reflection treatment and oleophobic coating can be easily damaged by tiny grit/dust particles that are unavoidable in many environments. The oleophobic coating is a chemical sacrificial layer that will wear-out over time.
A Screen Protector provides an additional defensive barrier - protecting both the original screen finish and the oleophobic coating. The downside is, perhaps, an increase in screen reflectivity and a slight reduction in contrast.
Your iPad screen is an expensive component of your iPad; a screen protector is a sacrificial layer that is easy and relatively cheap to replace. By contrast, the screen is a very expensive component.
Some contributors here will suggest that a screen protector is unnecessary - whilst others may be more cautious, favouring the additional protection afforded by a screen protector. It’s entirely your choice.