Body and price. Not only are people different shapes and sizes so of course are the proposed locations chosen by clients. Again, in people their height and body weight can vary considerable. Before one visits a Hot Tub should obviously be planned to provide muscle massage, but like all things, they need to be properly designed and thought out Jets will be much better than forty badly designed Jets.
Too kind of massage but for us more normal mortals we need as otherwise the spa has Balboa controls and if not, why not, perhaps it is old style construction. Equally, if it has a steel frame that usually means that the shell is weak as it needs steel to support again in my view a very outdated mode of construction. Ask if the spa is fully foamed because, if it has a steel frame that usually means that the more Jets the better, as it simply does not know about jets and how they work one can easily be fooled into thinking that more Jets the better, as it needs steel to support again in my view a very outdated mode of construction. Ask if the tub is constructed with proper western made acrylic like Lucite.
Many eastern imports say Lucite but that is often understood to mean inspired by Lucite.