Gorilla Glass 5 isn't breakproof. it's scratchproof. Think about it - the harder something is, the more difficult it is to scratch, but the easier it is to break. Uncooked spaghetti snaps like, well, spaghetti. Cooked? It's almost impossible to break, but you can scratch it with anything harder than a feather.
How difficult is it? That depends on the condition of your screen. Many small pieces? I wouldn't bother, I'd replace the screen. Removing 500 little pieces of glass without taring the screen or overheating it is just about impossible. 2 or 3 large pieces? That may be possible. But clear nail polish may do it. Or crazy glue. Or a windshield repair kit. It depends - again - on the condition of the screen. If it's not too bad, even putting a glass protector on it might hide the breaks.
But if it's really badly broken ... why do you think that the price of replacing the digitizer and replacing the screen is almost the same? They're insulating themselves against charging $200 to replace a totally smashed digitizer, only to be told that the customer's friend had a digitizer replaces last week for $90. (One crack, that doesn't even go all the way through the glass, is pretty easy. A smashed screen could take an hour, with long breaks every few minutes [so almost a full day] hust to remove all the old screen.)
Without seeing the screen I can't tell you - you'll have to look at it and decide. (But each piece of glass has to be removed separately, and you have to remove all of them, even sand-grain sized pieces. And removing shards, even if they're heated, can cause them to break, so you remove most of the shard, leaving 4 or 5 tiny pieces - each of which has to be removed - usually with tweezers. And that's the point at which you risk burning the screen.)