MTU matching is a best practice, not a must.
However, by discarding the other options, it is the only one which is not completely wrong besides "authentication settings".
Ref: https://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/200293-IS-IS-Adjacency-and-Area-Types.html#anc8
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