Cities and school districts would generally lower tax rates as they develop. That said, your point is legit and valid. Paying 2% for a 500k home is still much cheaper than paying 1.8% for an 800k home. This is very likely going to be the case for Celina, in a very good way actually.
Just left celina after 15 years City planners didn’t listen to traffic engineers, driving is a disaster, Indians taking all tech jobs, no longer a country town
There are reasons why young single people despise "boring" master-planned communities while older family people chase them. Great schools, family-oriented environment, clean, safe, and well-operated (a.k.a., boring to young people) planned communities are all important to families but clearly not to young people wanting to have fun in night clubs. Not saying one is better than the other, just saying different people chase different things - this is not a city for young people who want to enjoy lavish night lives.