People are missing out on the big picture. The F-35 is a pretty awesome piece of kit but it has one mission critical "failure" because the US is now focusing everything on China. To take on China, they want to have much, much greater range. The calculus involves 5th gen fighters stationed in Asia and aircraft available from carriers. All of those need range to attack Chinese positions and PLAN. PLAN is totally exposed but to reach targets on the mainland, they need to get past the PLAN and islands so that US carriers can be stationed right next to the coastlines. Do all that before thousands of Chinese cruise missiles and ballistic missiles are fired at those Asian bases and even the carriers.
If they had an extremely stealth (low flight/ high speed/ even lower signatures) that could allow them to fly as far as Tibet from those bases and carriers positioned well outside of PLAN's and mainland missile's engagement spheres, then they could do as they please. The F-35 doesn't give them anywhere close to that range with weapons and some combat maneuvers. One of the main requirements of their 6th gen platform is to extend the range of the fighter to perform strikes and air superiority at least as far as coastal provinces. Since the F-35 doesn't offer this, their next step in weapons procurement is to realise these capabilities and be able to truly bring the fight to China.
Therefore all the rush to bring 6th gen into service is so that they regain the momentum of being able to call the shots. At the moment, Chinese access denial will make it at least too expensive an exercise to attempt such an engagement. Once they have penetrating counter air, their carriers can sit comfortably outside PLA's engagement sphere while launching attacks as they please. Asian bases will be up for grabs but interceptor missiles are probably cheaper and easier to build than ballistic missiles, hypersonics and cruise missiles. While that problem may be settled by attrition, the carriers will be able to regain their effectiveness without becoming quite as exposed to perform their jobs.