but concentrating just on segwit.. lets list what segwit promised and if it has/hasnt achieved it
1. better transaction capacity: no
bytes per transaction has got worse since segwit.
segwit is actually more bloaty.
even with a 1.3x byte growth compared to ~2015 stats the tx count has not risen by 1.3x
But the reality says otherwise due to max. block size change from 1MB to 4.000.000 weight unit and SegWit have lower transaction weight size.
2. fee efficiency: no
fee's in 2015 where pennies with a top price of 25cents before users complained. fees now are more by averaging 25c
And without SegWit and SegWit adaption, it'd be worse since less transaction would fit info a block which would increase avg transaction fees.
Besides, using cents rather than satoshi makes your comparison useless because because Bitcoin price in 2019 is higher than 2015
devs want to introduce new opcodes to segwit that reintroduce malleability into segwit
I've heard this before, but couldn't any detailed info. Do you know any info or which opcodes which you believe will reintroduce malleability?