Just because something has always been done that way is not an excuse for continuing with contracts or contract processes that don’t work. To paraphrase Gareth Southgate (the England football manager) “you can write your own history.”
You can use your freedom to contract to agree pretty much anything and you should include clauses to avoid icky issues where possible. In this video I explain why I am a fan of one clause in particular (with a passing mention of football only):
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