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That’s a very debatable point. There are various studies in relation to wearing belts, I don’t think there is any definitive answer.
Belt usage can increase ab strength. Any programs I have looked at seem to say use a belt on your working weight but not the warmups.
If it helps with back safety, it can’t be a bad thing and any professional lifters I see on tv wear them - as good a pointer as anything.
TGR-
Belt usage can increase ab strength
Now I'm never taking my off...
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If you’re powerlifting or lifting a serious weight then a belt is beneficial
If you’re a novice or trying to learn proper form for an OHP for instance, then it’s unnecessary.
My gripe is that I see so many people use belts for like bicep curls and bench press
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Belt usage can increase ab strength
It assists the abs, it doesn’t make them stronger
ChainBreaker
dbadger
Because the OHP is a full body exercise, not an isolation exercise. The core should be doing a large portion of the work. If you're struggling with technique, the last thing you want to do cut corners by using a belt.
If you want to build just your shoulder strength / size, then a seated press is more efficient.
People seem to use belts as fashion accessories, they would be much stronger all around if core strength and flexibility was improved, then belts would be unnecessary.