I couldn't agree more.
"Mothering Sunday" had nothing to do with mothers.
It was a reference to the "mother" church in which people had been baptized.
It started off as a day of rest from fasting half-way through Lent and became a day off work for domestic servants to return home to their "mother" church.
It fell into oblivion during the 18th century because working conditions improved for the average person.
It was revived/reinvented in the UK by Constance Penswick who was inspired by Anna Jarvis, the American woman who campaigned for a dedicated national day to celebrate mothers in the USA.
Mother's Day was officially established in the USA in 1914 by
President Woodrow Wilson and it falls on the second Sunday in May each year.
Lots of other countries adopted the US celebration of mothers:
Canada, Australia, New Zealand, India, China, Japan, the Philippines, South Africa, Turkey and most European countries including Germany, Austria, Belgium, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Greece, Italy, Latvia, Malta, Netherlands, Slovakia, Switzerland and the Ukraine.
Mother's Day is also celebrated on the first Sunday in May in Spain, Portugal, Hungary and Lithuania.
Norway is an outlier as they celebrate Mother's Day on the second Sunday in February (they already had too many national holidays in May and decided that it would be nice to have one in February instead).