Keeping current
Yeah, without either paid courses, or at least some time set aside now and then for skills training (online tutorials or at least reading up on the current tech), one's skills are going to get out of date. If I were working somewhere that used, say, Python, Oracle and SAP, I enjoy Python and would probably read up on new developments on my own, but I would not be spending time outside work looking into any recent developments in Oracle and SAP.