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Besides we can still use that same land for crops with agrivoltaics
Or you could just do ground mount arrays somewhere because it's way cheaper to install and who cares about a 1% or whatever change in land usage.
Depends on the location. Around me, they're sometimes close to towns where the land could otherwise be used for homes or businesses in the medium-term future.
Also land is still a limited resource in much of the world. Why not use one piece of land for multiple purposes?
For sparsely populated areas I'll agree with you. Here in Europe, there's not a lot of completely unused land and in my country in particular most "unused" land is forests and bogs which have value of their own (sadly only 5% is wetlands nowadays - used to be over 20% before the soviets drained most of it). I'd much prefer those to remain untouched by both agriculture AND solar energy. Doing agriculture in a city is kinda hard, but solar is not. As a bonus, if solar panels in cities displace some of the demand for biofuels, that's biofuel-related land that could be used for something else.
You don't need unused land you just need to displace agriculture. If you have any land used for cattle grazing for example you can have enough grass to feed 1 cow or you can have enough solar to power 20-40 homes. Pretty obvious to me which is the more productive land usage there.
Or keep the cow and put solar on rooftops, car parks, etc. The cow shits out natural fertilizer which helps the land recover quicker so it can be used to produce more productive (in terms of people fed) crops again while the cow goes and grazes somewhere else where the soil's no longer very productive.
It's not a lot of land, sure, but there's literally zero downside to putting solar in places where shade is desirable anyway. Just mandating solar in car parks alone could provide a ridiculous amount of electricity in more car-dependent cities.