Plywood is often stronger than solid wood, but most importantly it doesn’t bend when drying or in moist environments if it’s properly cross-laminated. However, cheap IKEA furniture is often laminated fibre, which is basically compressed sawdust. It’s an entirely different material.
Not just while the wood is drying, wood 'movement' is something woodworkers have to take into consideration in almost every project. Everyone lives in an environment with humidity (some more than others) and when seasons change solid wood will expand and contract. Plywood is very stable with respect to humidity.
