Sorry, I meant to say I’m NOW arguing with company and my sub floor is concrete with porcelain tile on top. Now way to build floor up more.

You would have to check your local code for max height . IBC code is like 7 plus inches with in the exceptions. To get the door lower is a problem on concrete.

It has to sit on the concrete, you're not getting it any lower without cutting out concrete which would bring about a bunch of other issues if it can even be done. Plus a huge expense, again if even possible.

Ask for/do a transition strip to mitigate the tripping hazard.

It's not going any lower. Unless the house is built to accommodate that. Sorry and welcome to the new door guidelines. I suppose you could ask for an ADA threshold.

the interior lip's purpose is to prevent wind driven water intrusion.

Ours is exactly the same. there was any resolution according to the contactor. my grandchildren have hurt their toes REALLY painfully on this when they are here. They are used to their early 1990’s threshold sliding door at home which is very low. i will look into a transition strip. our doors open to a screened porch where water intrusion would be impossible due to design.

As has been alluded to above, this design is pretty "standard" now and has been for some time. While its understandable to be concerned about a tripping hazard, in reality its not the case unless there are some out of the ordinary circumstances. We've been installing similarly designed sliding doors for many years (thousands of units in service), and the next call we receive about folks actually tripping over it will be the first.

In the event that there are some circumstances where this creates a major issue for you (a family member has a wheel chair or some other mobility issues), you may need to consider a hinged door with ADA threshold if it is not available on their sliding unit (rarely is).

This is how doors are made now- hurricane code etc etc. When I remodeled my house we ended up adding 3/4” plywood over the original diagonal decking so I installed the doors on the old decking, then added 3/4 underlayment and 5/8” flooring which cut the lip down dramatically.