Heyas again!
I don't get what is your objective in chasing every commit that I do and recriminating every new tag that I add.
Are you a traffic sign hater that doesn't want any traffic signs in OSM whatsoever? Are you a traffic sign enthusiast that wants to learn what every new sign added to OSM is?

As I told you in the previous commit, this push of traffic signs that I'm doing lately is for the Catalan traffic sign tagging system.

Fortunately for you, now this tagging system has a forum discussion page here where we are working out the final bits of the standard:
https://community.openstreetmap.org/t/proposta-senyals-transit-catalunya/127587

And the wiki documentation page is being worked on here:
https://wiki.openstreetmap.org/wiki/User:Yopaseopor/Proposta_senyals_tr%C3%A0nsit_Catalunya

The wiki documentation contains a big table with a bunch of Spanish and Catalan destination signs and examples of how they are tagged. International traffic signs are also shown as additional samples (despite this tagging scheme only covering Catalonia for now).

As you can see, the tags for marking the destinations are based of the tags used in the Relation:destination_sign (https://wiki.openstreetmap.org/wiki/Relation:destination_sign#Tags). In our standard we use tags like "destination", "distance", "colour:back", "colour:text", "colour:arrow", "destination:ref", "destination:symbol"...

If the destination sign is structured like a list of more than one destination, we add numbers to the end of the above tags (":1" or nothing for the first and main destination, ":2" for the second, ":3" for the third, and so on).

If a destination text is too long for a single line, and it occupies more than one line in the sign, we place each line in a ":a" and ":b" tags. This also helps for references and icons where there are more than one in a single line, where they also get the letter-at-the-end-of-the-number treatment.

On roundabout signs, where there's a list of destinations per each exit of the roundabout, we place the direction of the exit before the number, via the tags ":through:", ":slight_right:", ":right:", ":sharp_right:", ":u_turn:", ":sharp_left:", ":left:" and ":slight_left:".

The result is a system that can tackle every destination traffic sign that we've encountered so far, at the expense of being super tag verbose in the most complex signs.

Feel free to deposit your feedback and opinions in English in the forum thread if you like. 

You may quickly realise upon glimpsing at the forum thread that we only talk yopaseopor and myself. That's because we are the only two users in the Catalan community that are traffic sign nerds and willing to work on their mapping and tagging.

We've had debates about traffic signs on the OSM Catalan Telegram group.
The four times we've done that in the recent weeks, there has been interest of other users to get into the traffic sign mapping once the standard is more defined; and also we hadn't received any negative nor any objections towards this standard from the Catalan community.

Your argument of these new tags being "of no use to any other data consumer" is easily defeated with these two straightforward reasons:
1) Apps that interact with traffic signs are limited and almost non-existent. The only one that I know of is the one that you've linked me on OSM DMs (and by your own admission, it doesn't support Spanish nor Catalan signs, so it doesn't affect in this case).
2) There weren't any traffic signs of any kind in Valls before my commits. This standard does not replace older traffic signs because there were none.

Of course, that all of this is of no use to any data consumer, if there aren't any data consumers to begin with!

If you want to join the conversation of this tagging scheme and deposit your opinion or provide feedback or whatever, feel free to come in the forum thread that I've linked above (you can talk in English, no worries, we don't bite)