Any reason not to generate my own custom ID value (NOT CUSTOM_ID)?

[TRS-80 <trs-80@isnotmyreal.name>]

First, I want to express my sincere and heart-felt gratitude to Carsten 
(and other contributors) for making and sharing this wonderful piece of 
software.  I have come to refer to it as "one of the gateway drugs to 
Emacs" (the other being Magit, IMHO).  It was certainly one of (if not 
/the/) main reason(s) why I started using Emacs initially.

I could in fact gush all day, however people are busy, so, on to the 
main issue...  :)

It seems to me that there is nothing really stopping me from inserting 
whatever value I like for value of "ID" Property.  Based on brief 
experimentation, org-store-link and org-insert-link seem to happily 
accept whatever value is already there (which I entered manually, for 
testing purposes).

However I seem to recall reading some warning somewhere about this, 
although I cannot seem to find it right now.

What I would like to do, is generate my own ID values in a more human 
readable format, something "ISO-like" for example "2020-09-10-1433" (as 
opposed to the default "uuid" method).  These sort of ID are still 
"Unique" (well, within my own system, anyway) as long as I am not 
generating them more often than once per minute[0].  And they have the 
advantages of being shorter, human readable, and meaningful.

Even when org-id-link-to-org-use-id and org-id-track-globally are both 
set to "t", org-id seems happy to insert my "ISO-like" ID right into the 
hash table and org-id-locations-file.

I do need the "across files" functionality.  My understanding is that 
this is main difference between ID and CUSTOM_ID (the latter being local 
only to the file).  Unless I am misunderstanding?

So, what am I missing here?  Any reason(s) /not/ to use my own custom ID 
value?

In addition to the general case, one particular area I am unsure about 
(as I have yet to get it working) is how this all works out with HTML 
export, as that is something I also wanted to get working at some point.

I tried studying some of the related sources (as well as mailing list 
archive), but could not seem to reach a conclusive answer.  I was hoping 
that some more knowledgeable people could confirm
whether this is a really bad idea, or not.  Any feedback would be 
greatly appreciated!

Cheers!

TRS-80

[0] It could easily be extended to second (or further) resolution, if 
needed.  For me, minute resolution will be fine.