flyfot: I feel Peter's is probably yet another development model, probably best described as 'standing on the shoulders of giants' (in the positive way that Newton had originally intended). Peter has worked tirelessly to port major software to RISC OS and make porting easier - in turn his ports are pieces of code written by others. Those libraries then exist for people to build from and on top of to produce further ports. Again, this is a very positive thing.
IMHO that's a separate development model from the NetSurf model where seemingly everything has been developed together and for a single purpose.
Both are IMHO ways forward for the platform, where we have deficiencies in a number of large-scale applications which would require multiple developers. However, the end results are different. Peter's work will bring applications from other OSes to our own. Netsurf's model would help develop large applications which are new to RISC OS.