If we have learned from amplifier evaluation that high resistance is bad for the sound, then why would we use it in a delicate low level phono stage?

We wouldn't!  99% of all phono stages use RC networks for RIAA correction.   Elimintating that large series resistance and replacing it with an LCR network has resulted in greatly improved dynamics. 

step-up tailored to your needs... preferably Intact Audio 80% nickel... Jensen if you must keep it small....

LCR Grooves

LCR based RIAA Corrector

two chassis - one power supply, one signal

most hardwoods available

standard tubes are Amperex 7788 input and 56 output

optional Western Electric version including a directly heated 101 tennis ball output

rectifiers are either vacuum or mercury, your choice

LCR inductors are Stevens & Billington 10k or

optional Intact Audio discrtete 80% nickel inductors with hand potted teflon capcitors

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other chassis

dovetailed cherry or maple with exposed hardware