This is highly recommended. The extra triangle stock you mentioned does not really speak to the real weakness of this landing gear block. The block is mile hardwood with a very fragile grain structure. A moderate landing that wouldn't even bend your aluminum gear would still be hard enough to break this block along the wood grain and take out the bottom of your fuselage. The same size block made out of multi-ply plywood would have been a better choice.

After my moderate landing tore out the bottom of the fuselage I CA'd it back in place as well as I could. I then epoxied the hell out of it and layered carbon fiber cloth inside and out. It looks like hell but it hasn't and will not break again there, no matter how hard I land.