Moto G5+ (No more security updates - how important are they?)

[Marc999]

I purchased a Moto G5+ (4 gb/64 gb) phone almost 2 years ago, (Sept/14/2017) cert.refurbished/unlocked. It's running Android 8.1.0

It is no longer receiving security updates.

I am perfectly satisfied with the phone, yet I'm wondering how important is it to have a phone that is continually scheduled to received security updates?
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Usage:
Browsing internet,phone calls,text,email,streaming to chromecast, GPS, banking apps. All apps updated via Play Store.
I also have Avast Antivirus on the phone, if that helps at all.
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I'd prefer not to rush out and purchase another phone, if it's really not a dangerous prospect in using it.

Thoughts?

 

[B. Diddy]

I think JR Raphael has a lot of smart things to say about updates: https://www.computerworld.com/article/3339621/android-upgrades-matter.html