Depending on your company's SOP approaching the MDA, it is essential because it tells you what FPA angle to set approaching the MDA/DDA. If the chart says 3.46°, no point in setting 3° if you really want to get in. Similarly in this case, if you set 3°, you'll end up low as the approach angle is 2.8°.
Er, please tell me you're not serious. How/where would you "set" FPA approaching MDA? At MDA you're either visual or you go-around. If you've flown the approach as a CDFA (Continuous Descent Final Approach) - as jets are - as opposed to "dive'n'drive" then you're already on the FPA you should be - there is nothing to "set". Leave the autos in to acquire the visual picture, disconnect and then FLY THE AIRCRAFT VISUALLY TO THE TOUCHDOWN POINT. Don't chase the PAPI's aim to touchdown abeam them on the runway.
The notion of fiddling with MCP/FCU selections when visual <400' AGL is foolish. If you've flown the approach correctly then at MDA/DA you're in exactly the correct spot, on "FPA", to complete the manoeuvre visually.
A4