I can understand the…

I can understand the frustration many Ontarians feel about finding an affordable or attainable home in a place they want to live. For many people, this will not be solved by building more homes, only by limiting who can buy them. It is important that social housing be included. Europe learned this after the First World War and social housing accelerated rapidly across Europe from the late 1920s. No doubt some of this acceleration was to placate veterans and families of soldiers who struggled to find housing on low or no incomes. Ontario, sadly, carries an enormous debt thanks to previous government failings, so it is not well placed to pay for social housing despite its prosperity to which you speak. But it is not fair, or logical, to burden the taxpayer. Whether you make social housing, or private sector housing, the taxpayer will be on the hook for expansion of infrastructure. It would be less damaging and more sustainable to build in, and up, than to sprawl, and it is inner towns and cities where social housing would have the best support systems in place. So, if you must build faster, build in and up faster and make social housing part of the equation without creating crime centres or ghettos. For example, in the one building near a transit centre the municipality or housing association is obligated to buy or lease small, one-bedroom to two-bedroom lower-level apartments for social housing which could be rent-to-own, or rented, or bought outright by an existing tenant as they advance their career and livlihood; mid-level apartments are larger - own to rent; upper levels and penthouse - open market.
Agricultural land grade 1 or 2 must be protected and not built upon. This is a finite resource, it can't be replaced. The speculation of urban sprawl has contributed to the burden of farming, as sub-urban land prices skyrocket far beyond economic farming viability, with developers renting land to farmers growing a commodity where prices are fixed by the buyer (and, as a farmer, you can't keep what you produced for very long to wait for prices to go up more). If you must allow building on agricultural lands, there must be subsidies and supports for the farmers to produce elsewhere, to ensure they can still make a living. Most farms do not survive as of right, they require off-farm income to survive, as it is such an uncertain way to make a living. Reducing our agricultural lands to permit housing only exacerbates this problem, the farmers that remain need ever bigger and more expensive machinery, fuel, inputs and overheads, and drive food prices even higher.
I do not support rural home building without meaningful, at least weekly, public transit between rural and city centres and no minor variances allowed to diminish lot size minimums for healthy septic systems.