All but useless for agri/bio/medtech and optics/physics/chem. I've gotten nothing but spammers and black-holes. LI has a nasty habit of not taking job openings

All but useless for agri/bio/medtech and optics/physics/chem. I've gotten nothing but spammers and black-holes. LI has a nasty habit of not taking job openings offline when they are closed. So even though the job search returns results, the companies/firms aren't hiring anymore and haven't for months to years. As such, even for lead generation of companies to contact it's useless as the firm may not even exist anymore and you just send emails into void. The few times you do get a job that is 'live', it's usually just a spammer from India or the Philippines (4/5 times) that then sells your data onwards and you get a burst of spam calls for about 3 months afterwards. Avoid at all costs.