Visio Guy

Microsoft identified a security issue with signed VBA code, more info here:
https://developer.microsoft.com/en-us/sharepoint/blogs/upgrade-signed-office-vba-macro-projects-to-v3-signature/

"This vulnerability might enable a malicious user to tamper with a signed VBA project without invalidating its digital signature."

That is very serious, code with malware/ransomware could be released by a bad actor under someone else's digital signature, making it look like they (for instance a reputable company) released this malicious piece of software.

VBA macro with digital signature? 
I never meet it 

It is useful for macros used by companies with IT security policies.

About 2 years ago i read discussion "VBA death come soon"!
Supportes of conspiracy theory have called the first sign of the beginning of this: VBA will declare potentially dangerous. After that, large companies (IT security policies) will begin to refuse it, and so on...

Like 70% of the world economy depends directly on VBA.
VBA will never die

OfficeScripts for Excel, "the successor of VBA", is still far removed from VBA's capabilities. For Visio there is no OfficeScripts...

Meanwhile Visual Basic is getting a huge new Visual Studio Code-based solution with which you can develop VB and VB.NET applications, when they add VBA to this solution it will be huge. See https://www.twinbasic.com/

This guy has also developed vbWatchDog, by far the best error handler for VBA I could find. Saves tons of development time because error handling in VBA is terrible and this error handler does it for you. See https://www.everythingaccess.com/vbwatchdog.asp

vbWatchDog isn't cheap though, $295 with one year support, but if you hate writing error handling code in VBA it is worth it.