So first of all: Town & Country is a franchise, you are not building with the "big company Town & Country" but with a small local office which draws on the Town & Country model house program, their standard contracts, marketing, etc.
Since Town & Country (let's call it that) builds "solid" (hence the lower price), they try to offer the customer added value through the "security" angle. That is their sales model. But how naive are you? The Town & Country partner wants to build with you as quickly as possible, he wants your money! He brokers a plot of land for you.
Do you really think he would say: "You better not sign the land contract"? Don’t you see the conflict of interest?
If the Town & Country partner really has plots of land that he is allowed to broker exclusively, at least have them shown to you before signing the contract. The fraud with the property transfer tax is bad enough with developer plots, and on top of that you lose any negotiating room on the house (you can't say, then I’ll just build with someone else). You should only accept these disadvantages if the plot fits 100%, which at the moment you can only hope for.
House construction contracts always have 2 withdrawal reasons: financing and land. Both cases are traps. Yes, many builders can report having been talked into a contract too quickly.