Honda Civic like many other cars on the market don't have a single frame door. The upper portion and the lower portion comes in pieces. The weld will be there.. Its matter of proper improper weld. like not filling of joint gaps like in below picture . Putting the weld on top of joint vs putting a weld within joint has a altogether different outcome.. You can clearly see two welds examples and compare it.
There is difference in making a bead and spreading weld on top of joint like a butter on a slice.. are different things. Proper Bead has really a value, It works as reinforcement.
As we discussed. The weld issues are no more on display cars and I am sure its removed on many cars as many members already shared it.
Being a professional Civil Engineer, We have a complete weld code in our building engineering and the application of weld do matter a lot. Like where, and how much weld you need to apply during section connections.