I am not trying to tell people what to do because every ones situation and uses are different. I just pass on my experience and opinions. I am going to pass on two dealings with alloy.

On my MT 1 before I up dated to all most MT 2 SS specifications I made it just about all alloy. A arms, A arm mounts, hubs, diff cases and so on. I hit a mailbox post and do to the breakage passing on to the next weakest point it bent my chassis. To me it is much easier and cheaper to replace plastic parts as well as plastic has some give with out breaking or bending.

On my Mini-Z F1’s I had trouble with my front axels coming out of the knuckles so I went alloy. Then I started breaking tie rods so I went alloy on them and then I started stripping servo gears. So I found out it was cheaper and easier to either replace or glue the axels in the knuckles.

As far as some play in the A arms if you are running on road I can see where this will make a difference but not on off road or not near as much. Now I said some not excessive! But if you want to run alloy that is all up to the user but I have seen plenty of alloy bend and or break which is much more expensive to replace as well as heavy if you race. But one thing is for sure alloy looks GOOD.