Experienced sysadmins knows that it's very likely for a successful application to be in place for well over 5 years. They will know this from having been the p

Experienced sysadmins knows that it's very likely for a successful application to be in place for well over 5 years. They will know this from having been the person who had had to take over such systems from others, several times. They will know that any proprietary code will have to be supportable even after the developers are gone. The systems themselves will have to be supportable by new sysadmins. The system will have to be able to receive security patches and fixes. They will know all this will be needed for multiple systems in the same company. They will know that many promising technologies will come and go. They will know how much it sucks taking over systems where these things weren't thought through. They will remember systems they have left for others which would have not have these things considered. They will remember abandoning systems themselves that became unmanageable because these things weren't considered. Inexperienced developers and system administrators treat servers like new desktops, with desktop focussed operating systems, new software being added to it all the time, changes being made in an increasingly unrepeatable manner, and the whole thing being replaced every 2 years.