I have used starting fluid in both gas and diesel, for different reasons. On a gasser, something it helps to “prime” everything in a carb setup…. With it actually running the vacuum pulls fuel through the carb like “normal”, however, if I am using this technique, I normally try and grab something like carb cleaner or maybe brake cleaner…. isn’t quiet as “violent“ as starting fluid (ether)
I have also used it on Diesels, I do agree, no or dead glow plus only (one of our IDI’s has dead plugs right now).. but I use it VERY sparingly, like a half second spritz….. and I normally try and only use it while cranking the engine over, not just spray it in, and then hit the key….. I have found that ether can be used with out harm, as long as it is use properly. But that is normally the issue… properly…. most times i see “if a little is good, more is better”……