The last time I transited T2 to T1, eight walkways on the Skylink were u/s, so if now there is only three u/s that is an improvement.
I believe security queues are engineered to sell fast track, the next one coming is a paid for fast track inbound through Immigration.
I avoid T3 where possible & I find T2 security the worst. I agree the TP is 10 years too late with too little too late. T1 pier B arrivals are dire.
However, it's not so bad I would avoid the airport altogether, I have used worse. If you are fortunate to use it off peak then it's not a bad experience. However, I would agree that there is simply no more room for anymore peak period services.