In the past I mostly didn't approve of steel gauntlets for two reasons – firstly because they often have ‘offensive’ bits (edges etc) and secondly because they usually seemed to be used by people using excessive force and bad technique.
However, these days we wear good and all-encompassing protective kit for steel sparring, so there is no danger of injury from the gauntlets themselves (my objections before mostly centred on nylon sparring where many people have bare skin in places).
Many types of gauntlet give poor mobility and heavy weight for ‘blossfechten’ sparring, however if someone has gauntlets that they are prepared to use then I don’t have a problem with it anymore – especially as we don’t have any good lighter weight alternatives for steel longsword/feder sparring. I have even thought about putting together a special pair of steel gauntlets for ‘blossfechten’ (easy to reduce their weight by having a leather cuff for example), but since I did some alterations to my regular gauntlets I now have far more mobility than before and I don’t think the weight bothers me (in fact they are also lighter than before, thanks to my alterations!). I would personally rather have a tight-fitting pair of heavy gloves (eg. Gauntlets) than a massive pair of lighter gloves (such as the Brine Supercross).