I only ever can pickle relish, piccalilli and jam. Never even occurred to me to use the oven to sterilize jars. I found this online and think you may find it an interesting read. I sure did. Boiling the jars and lids in water is best, I think
Yes I think what I'll do from now on is use the oven if I am just making a few jars of something that I know won't last long before I eat it all, like pickles. Big batches of stuff and jams etc that will be a long time before I eat it all, I'll use the hot water to sterilize them.