In the interest of making sure our medicals are cleared, we went ahead to have our medicals done. We prefer to get these out of the way so that we can "focus" on the waiting game alone.
There are many stories where they did not have any prior history or exposure of TB but after the medicals, they would need to do additional treatments. (Pag minalas or kapag may "nakita" na TB cloud sa x-ray) I would rather address those NOW rather than wait for an S56 and clear it within a few months of taking medications.
It depends on what you value. We value peace of mind kaya we went ahead. So far looking at the timelines, wala naman napapa ulit na medicals na UNLESS you have used it elsewhere (student visa/ other visa etc), tapos recycled for the skilled visa (meaning it doesnt have the full 1year validity).
For PCC peanuts lang mag renew, as a matter of fact, I have obtained my PCC from SG and NBI. Will be standing by these docs in the coming weeks.
HTH.