"We dug through the code and found there was a hardcoded limit on the wallet file size of 1 GB, inherited from Monero."
I'm not an expert by any means so I might missed something and my thought is nonsense but this must have to do something with the fact that ETN has a huge supply so tx sizes should be also considerably bigger, right? We don't hear about such problems with Monero and Dero's total supply is the same. So I guess this must be another fail of ETN devs' quick copy&paste job lol. Correct me if I'm wrong.
You identified the part that I figured would most apply to DERO - a hard-coded limit on the wallet file size that is intended to prevent overly-long times in loading the file and executing transactions, etc., on it.
However, eventually ANY wallet.dat file will grow beyond reason given enough activity/use if there isn't some means of archiving old transactions. I felt that pointing out the issue with ETN/Cryptopia might give the DERO devs a head-start on dealing with the problem before it becomes a problem, so to speak.
This is not a problem for Dero. These things were solved with the new code
It has been tested to make sure it can handle millions of transactions without errors