Question about Icy Box Ergonomic table frame without table top, IB-EW206B-T

Alsu basically nothing wobbles as long as you use a really solid table top... I first cut a 2.5 cm multi-layer board to size and pasted it on. That wasn't a very good idea: it wobbles and wobbles and the table can actually be bent. I then used several solid wood beams to hold it in place. It got better / but I wouldn't do it again. A good piece of solid oak or a piece of redwood would be better. Or teak, or mahogany - but you can no longer get them at the DIY store or behind the house in the forest...

The frame is great. Technically not really sophisticated. But what is it supposed to do other than hold the table?