If you just want something lightweight to open text files but still have some basic syntax highlighting, there are heaps of choices that are better Mac apps. I'd suggest any/all of these three (all of which happen to be OSS but that's not why I recommend them - I didn't actually realise until now that they all are)
- SubEthaEdit: https://subethaedit.net
- CotEditor: https://coteditor.com
- TextMate: https://macromates.com