Would you think it normal or necessary to contact your ISP ahead of time should
you choose to start surfing secure websites outside of your country?
Well, your ISP doesn't look at what websites you are visiting (or shouldn't).
Unless your ISP is a Cell provider or Dialup account, there's no way you left the country and still use your ISP's services.
Let's try another one: Would you think it's necessary to inform your ISP you will be accessing your e-mail account from outside the country?
(HINT: Many ISPs use geoblocking. On an ISP provided e-mail account, many times overseas IP addresses will be blocked by firewall from contacting the ISP's servers over POP3 or SMTP)
Ah, in order to put this back into the context of the original discussion, let me clarify. In my ISP example, I was referring to you sitting in your home on your chosen ISPs network attempting to contact a server or services on the internet that happened to be hosted outside of your country. Obviously this happens rather seamlessly all the time for consumers, as we don't hold the burden of ensuring we get the "OK" from our ISP before doing so.
The same should apply for any banking institution and the framework they wish to do business in.
Let's try another one.... would you think it's normal or necessary to contact your Cell phone carrier, before leaving the country and thus using international data roaming service?
Only if I was a moron who failed to understand that 99.999% of cell phone data plans do not include international support by default.
And if I did have an international data plan already configured on my device (as I do with corporate devices I manage), no I do not feel it necessary to alert my cellular provider. Again, the burden of security belongs to the players who built the framework they operate in. If you can't manager services seamlessly for the consumer, then stop offering the service. It is that simple.