That's what scares me, having a hidden bug when using the tool to encrypt the seed or not being able to find a good version of the tool when I want to decrypt the seed in several years. That's why I'd need a very standardized and reliable tool to encrypt. BIP38 seemed perfect for that.
AES itself is standardized, you just have to know what you are doing when setting the parameters such as padding. cipher mode, etc. so that you can replicate it using any other tool.
BIP38 itself is not that popular either. The major wallets don't support it and the implementations are rare and mostly web tools that may be open source like bitaddress.org.