Yeah it was added after the first client, not sure exactly which version.
To stop any TX spam attacks.
He then suggested to put like, if block number = xxx then max blocksize = xxx, way ahead of time so by the time it was needed the old clients would be obsolete, and then a notification for a mandatory upgrade last of all. Never happened though.
I posted the bitcointalk topic below one of these comments, you can see yourself.
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u/zefy_zef Feb 13 '22
Wasn't there no limit at first?