it's not hostility, it's concern for people wasting money, having been through something myself which I've seen repeat ad nauseam for other people.
you buy the HPFP upgrade because you only read the posts from people insisting it "works fine for them." it dies because of poor assembly, non-clean room conditions, etc. your car is already modded/tuned AND you're now more wary of unreliable parts, so you want to move past an IS38. this means you probably need MPI to run full e85 anyway. at this point, you go back to a stock HPFP, add MPI, sell the old HPFP/internals, and call it a learning experience. your intake valves are cleaner, you've got a low pressure fuel sensor so fuel pressure before the HPFP is no longer a black box. life is good.
that experience is what we want to pass on, but saving people the expensive part. end of the day, OEM parts are going to be more reliable, and depending how you classify the bosch injectors, MPI is essentially a fully OEM upgrade.