Why would a shop refuse to fill a steel tank if it passes both hydro and visual inspections. I have never heard of a steel tank exploding. It sounds like the shop wants to sell you some there own gear as well as a good load of BS. I have purchased four Lp72's in the last year all older than me and all are now happily in service.
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Acctually there have been steel tanks that have ruptured. But all of them, with the exception of those involved in actions such as fires, were caused by excessive corrosion that could have been caught IF they had been current on hydros and Vis inspections (but they were not).