tides do not go offshore for miles and miles
Take a look at the Atlantic shelf and tell me if it does not look like the ancient shoreline was at a way lower sea level? worn away for millions of years...
Moon and sun gravity effects are not limited just to coastal regions.
Ground levels also rise and fall. Subduction zones push up mountains. Rift valleys drop and widen as the continents are stretched. The Himalayan mountains rise a couple feet a year.