To do a Code task or not!

I as a Senior Software Engineer, when think of applying for a job, few things come to my min.

1. What if as a Senior I don't fullfil the expectation?
2. What if I was presented a Live Coding Challenge?
3. What if I was given a Coding Task?

So after some thinking, I realised it all comes to judge me based on my coding skills.

When you work on a real challenge you use StackOverflow, Google etc etc. (Copy & Paste works in most cases, except some complex business logic)

But as you code for an interview offline or online, you think about Copy & Paste method. In live coding you can't even do that. For offline coding you can get inspired from some logic you find online.

My question is, what should be the ideal approach to these problems during job interviews?

Should coding is good metric to judge someone? Live coding makes sense? Or Git repos with some code exploring should be a metric.

Share your thoughts, experiences, Lets learn together.