tokul
Numismatics is normally about the way coin or note looks and not about its exchange rate at the time of circulation.
“First ruble until 1922” ignores changes in 1704, 1718, 1797, 1886, 1897. And those are just most obvious dates with pre Peter I rubles crying in the corner.
There were entirely new ruble created six times in the twentieth century, plus the chervonets. The earlier reforms you mention affected the exchange rate of the ruble with other countries or changed the subdivision (the latter should certainly not be ignored). The reforms I mentioned replaced one ruble with another at a rate other than parity. We have a field for the currency precisely to record this information.
I'm more surprised that there is no info about 1993 reform and the 1991 one (when the currency of one country was changed to a currency of another country) was fictitious
In what way did the currency change in 1991 or 1993? Of course the country changed, as I described, but the currency remained the same.
Former Numista referee for banknotes from Ireland, Northern Ireland, Scotland, Wales and Saint Helena.