Whatever TS may mean, it is obvious that signal squares only add value if properly kept up, and adjusted to current situations and their changes.
I understood this was the reason for French authorities to discourage them: they require an "able" and "authorised" person to be on site whenever the field is open, which not all operators managed to realise; causing the closure of quite a few fields. A medicament improperly administered can indeed be worse than no medicament at all. Is that a sufficient reason to not apply medicaments?
NB already flabbergasted by the "TS", I'll be glad to learn what a "Jackeroo" might be.