I will say the same, never used oil through pushrods or restrictors. And even use the thickest walled 5/16 push rods with schubeck lifters on cheap comp or K motion springs (depending on the cam) and never had an issue shifting up to 7500. The only thing ive questioned at times is when I use grooved cam bearings then buy a cam thats also grooved.

Try not to over think some things.