Your question should be:
Is it unadvisable to use a Blizzard A1260 (without SCSI module attached) in an Amiga 1200 with the original A1200 powersupply?
The answer to that question is:
Yes it is undadvisable. It just isn't worth the risk of damaging things.
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I really dont know what you are basing these statements on.. Of course you can run a Blizz 1260 in a desktop a1200 case with the org psu. As a matter of fact, an 060 takes LESS power than an 030! Also a stock 060@50mhz runs pretty cool imho.
