What are the disadvantages of flange ball valves and internal thread ball valves?

I talked a lot about the advantages of the flange ball valve, but did not say the disadvantages:
     The disadvantages of the flange ball valve: high cost, large volume, generally require two or more people to complete the installation. The choice is generally DN15-DN25 caliber. The advantages of the internal thread ball valve: small size, easy to install, generally suitable for home improvement construction, or small pipes such as steam pipes. The price is cheap and the cost is low for the factory.
National standard flange ball valve
1.Flange connection, easy to install; with stainless steel bracket, easy to disassemble;
2. Stainless steel ball valve float ball structure, good sealing;
3.YJ actuators are available in switch type, intelligent type, adjustability, etc.; submitted compact, precise wear resistance, reliable performance and long service life;
4. With protection device: double limit, overheat protection, overload protection; switch speed can be selected with 5S, 10S, 15S, 30S, 60S, etc.
   Disadvantages of internal thread ball valves: damage is not easy to disassemble, especially fixed pipes. Sustained ability to withstand stress. The general choice is the specification below the DN50 pipe.