It teaches resource management, keeps you in the fight, and is one of the smartest purchase choices for a long-term deck
According to the rules the process of casting creature cards (or any other non-land cards) consists of the following stages: you put a creature card on the stack, define its total casting cost and it locks in, then you get a chance to activate mana abilities (but only if the total cost requires mana), and, finally, you pay the cost
Before this card was unified under this name, there were professor cards with different names that also shared the same effect, and, due to ruling issues, the Professor's Research cards were created to stop future issues if The Pokemon Company wanted to print professor cards
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If you are building a deck or looking for specific cards, singles are often the more efficient option