There are Chinese tea drinkers I know that do not like aluminium tea trays. It is either you like it or you don't. Negative comments include 'it is so metallic' (yes, aluminium is metallic), 'its so shiny', 'wood trays are more classy and traditional' to 'its too cheap looking'.
I happen to use and own one round aluminium tea tray that I use weekly when I brew tea in the kitchen.....and I had been using it for almost 10 years. I had no issues with it except now that the tea stains are now quite difficult to remove.
As you can see from the pix, I had actually lined the replacements for my current aluminium tea tray in the event it broke (which is unlikely). I got myself a similar round one and a rectangular version. Both lids are removable and are easy to maintain. They can be washed with detergent can easily be kept away.
I have to agree that the wood and stone tea trays are visually more attractive. Wooden ones may have a limited life span as the wood joints may deteriorate after long contact with water. The hardier stone trays may be a hassle to stow away especially if you need the tea brewing space for other activities.
You can even dispense with the use of a tea tray. All you need is a bigger tea waste bowl and careful pouring of your water and you can have a happy tea session without a tea tray.
Tea trays are not expensive and one tray would last you quite a long time. Are you using one?