There have been multiple suggestions on renaming models and i think it mainly breaks down to:
Models get confusing.

When i get a decent structural design on a model i tend to stick with it, but that gets confusing very quickly. Is my Abraham IV my mobile lightly armoured anti-infantry tank or my ...

<t> Having the choice between a new model and a new variant would be great. A new variant does not get any technology boosts and will keep the same design stats as the base, but will allow for all parameters (engine, weapon armor etc.) to be changed. If you want to apply technology boosts or improve ...

<t> A small suggestion that imo could make the model system easier to organize:<br/>
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Currently a Model gets a random name. Every successive model gets Model Name {Number}. I found myself building variants of the same model using the successor system. For example i have 2 Light Bombers, named ...