using an insecured ‘public open wireless zone hotspot’ ; always unsafe and a security risk?

somewhere from yes to a little, it mostly depends on your browsing habits.
https connections to webservers are less to worry about. Because of their encrypted point-to-point tunneling from your device to the destination webserver and back, they are like using one VPN tunnel for al traffic, just this case a different one for every website.
To not  send out the sites you visit and texts you type visible for others in the range of your wifi device /acces point, even potentially get served fake webpages, don’t use plain http for any content revealing about or sensitive to you if you are in this situation, if you can avoid it

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