vochindik : Lo sossur only applies to halachos, not to “milei d’alma”. Ironically, the halocho is contrary to what you are porposing. If you want to say that the gedolim you mention are now contradicting the halochos and we should follow them because of “lo sossur’, then say so.
On the other point, the discussion here was not about college- we can argue about this. The argument here is whether to ‘just learn Torah and always Torah” and do nothing else. On that, quite clearly, the many halochos from the gemoro onwards weigh prepodantly on the side of having a job and working.
May I point out that the chassidische rebbes, by and large, counsel their chassidim to have a job.