We have a high end bosch (the absolute best model of the best brand the year we bought it), and it’s been wonky for three of the five years it has lasted so far, and now rubber noiseproofing is falling out and the racks are rusting through / breaking.

Definitely keep the old dishwasher till it dies.

(The bosch is quiet and cleans well, fwiw. The magic heat free drying minerals are nice. It’s a shame they’ll be in a landfill in a few years.)