[thomascharlie905 (OP)]

Top loading dishwashers are not manufactured anymore by known brands because front loading dishwashers became more popular among consumers. After all, they were easily convertible to a portable dishwasher from a built-in one.
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Since it was considerably cost-effective for these brands to produce only one kind of dishwasher i.e. the front loading dishwasher, they stopped manufacturing the top loading dishwashers.
A top loading dishwasher might be a tempting choice due to its ease of use and cheaper cost, but finding one can be really tiresome for you. Since most companies do not manufacture top loading dishwashers anymore, you’ll probably have to buy a used one with no official warranty.
Maintaining it can be just as hard. You will have a hard time finding the right person for repairing it.
All in all, it is better to invest in a front loading dishwasher rather than its top loading counterpart.