Re: Training in other schools of aikido
I wouldn't call it a forced loyalty, but rather (as Jean stated) this is the price of the instructor's time. By entering into that agreement you acknowledge and accept that limitation.
An analogy I see would be choosing between, say Japanese citizenship and Canadian citizenship. My kids will have to choose at the age of 18 whether they are going to be Canadian or Japanese because the Japanese government says that if you are a Japanese citizen then you cannot hold citizenship in any other country. The government says that at the age of 18 you must decide.
The Canadian government, on the other hand, allows its citizens to also be citizens of another country and to hold multiple passports.
Should we advise all Japanese to go become another nationality because of this restriction placed on them? Its a little absurd to suggest that, but this is still the price of being Japanese.