I cut my cooking and baking teeth on Wolf and Viking commercial ranges turning out meals and baked goods for hungry firemen for 27 years. I recall no problems with hot/cold spots or jacked up simmering. Same goes for the mid-50’s Gaffers & Sattler (memories, Ancient Mariner?) dual wall mount oven and cooktop gas appliances that were in an old house I bought some time back. Maybe the problems some are having are brand or model specific.
I’ve never burned milk for custard when heating it over a gas flame, but those disasters on electric cooktops are many and legendary.
Those gas cooktop griddles clean up in a snap with no PITA issues when you clean them while they’re still somewhat hot, then use a stone followed by a steaming hot wet kitchen towel for the followup.