Because inflation doesn't take into account all the improvements that have been made. A liter of milk or a dozen eggs may almost be the same in 1630 and 2019. A square kilometer of farm land is not, since the crop yield today far exceeds that of 1630 (it has increased almost tenfold since 1930 due to mechanization, fertilizers and new grain types). So the same piece of land that could feed a family in 1930 now almost feeds 10 families. And, more importantly, land has many more applications now than back then: Factories, sky scrapers, airports, gardens, etc.
Take our homes. In the 1630s, homes had almost no insulation, no electricity, no central heat, no air conditioning, no shower, actually no running water, not even cold. The people who lived there inhaled smoke from the fireplace all day. They had no toilets or sewers, no internet, no cable TV or radio or cell phone connection. From evening until morning they sat in almost complete darkness since candles or oil lamps or whatever they used were crazy expensive. Houses weren't fire proof, barely water proof, wind proof or earth quake safe.
What I describe was true for the richest too. The very richest king or business owner in 1630 lived in a home, which fits my description. How do you even begin to compare his wealth to your wealth? 1,000 servants still couldn't bring him a tiny fraction of the comfort we enjoy. The very richest king in 1630 was dead poor compared to you. And that's just the material part. People were also exposed to crime in a way that we cannot even begin to imagine, and which you wouldn't even find today in our poorest neighborhoods. And their life would likely end decades before ours, and be a lot more painful. Even the richest business owner would not be able to stop his headache with a pill the way you or I can. Or tooth aches. Or fix a broken leg. A small wound could kill him. Most would see a number of their children die, maybe also wife in child birth.
Inflation numbers capture none of this.