A badly drafted contract is not a small error. It is the reason otherwise healthy businesses end up in litigation they cannot afford.
Where downloaded templates fail
They are written for a different legal system, they do not identify the parties correctly, and they omit the clauses that only matter when something goes wrong. The most common gaps we see:
Intellectual property. A contract with an agency, a developer or a designer that does not expressly assign the resulting work leaves the supplier owning it. Under Mexican copyright law an assignment must be in writing to be effective.
Termination. No mechanism to exit, no notice period, no consequences. Both parties are trapped or both walk away and argue about it.
Confidentiality and non-solicitation. Absent or unenforceably broad.
Dispute resolution. No governing law, no forum, no escalation, which means the fight starts with a fight about where to fight.
Payment. No default interest, no suspension right, no security.
The economics
Having a contract properly drafted or reviewed costs a fraction of one week of litigation. If a document governs money, intellectual property or a relationship you cannot afford to lose, have it read by someone before you sign it, not after.