Some of the criticism the NRM gets is so unfair and some still is frankly based on complete misinformation. I suppose that is just what happens when politicians and politics are involved.
The NRM was designed from the outset as a closed cabin bus with full environmental control. AFAIK this was a new innovation for a standard London bus.
The NRM was designed from the outset with a closeable door fitted to an open rear platform to allow it to be used as either a one or two person operated bus suited to the nature of London work, a broad mix of intensive urban and suburban running as well as night service. AFAIK this had never been done, and was an advance even on the original Routemaster (two basic variants for London work, a two man bus and a one man "coach").
The NRM was designed from the outset to be a London icon and a functional London bus. Hence it was designed in partnership with TfL to its precise requirements. They would then own (lease) and operate (tender) it for its entire working life, refurbishing and upgrading as necessary. This had not been attempted since the 1950s, and not at all under a tendering system.
The unit cost of the NRM was always going to go down, hopefully not just matching but falling below that of a "regular bus" (which at the time was still a conventional diesel with minimal London specific features). Pretty hard to do that if you cancel the project without having even supplied an eighth of the total London bus fleet or operated for even half of the very first tender to be awarded with NRMs.
I don't think people really understand how innovative this was at the time, a clear fifteen years ago or more. And they most definitely don't realise the money and effort Wrightbus put into completely re-imagining their entire business to give the UK a head start in hybrid buses or any other promising alternative. Hybrid being something many people at that time were still arguing might be a fad. Something to be quickly eclipsed by lng, hydrogen or full electrics. Now we know. They knew what they were doing. We failed them, not the other way around.
The plan was sound. Austerity and later Covid has completely derailed far bigger projects than the NRM. But there It is, ready and willing to help Khan get re-elected in a use hitherto unimagined by TfL, a SuperLoop. There are Hollywood movies and merchandise featuring this new London icon. The styling was even copied by ADL. Tourists do know. Hence the status of the original.
Hybrid technology was a much needed bridge to full electric. With Wrightbus 1.0 gone, the initiative has been lost to our European and Chinese competitors. The broken model of bus procurement is unchanged, despite the huge later focus on the broken model of operation that spawned it.
But the changes Wrightbus 1.0 made were so foresighted, unsurprising given it wasn't exactly their first turn as a London pioneer, Wrigbtbus 2.0 was well placed to rapidly recover. But not before proving there was still a market for bespoke buses designed in partnership with a municipal with higher goals than just minding every penny. Alas, it was only for 30 buses (Lothian tour fleet).
And so now it's ADL, the main beneficiary of Khan's decision, who apparently seem to be unable to answer the fundamental questions that still exist now the co-design/lifetime lease model has been dumped. How much is it and what does it weigh? And can I buy it directly from the folk who make half of it, cheaper?