Does anybody else think that the original post is a joke? If it is, the OP has been very successful.
The OP wants a 67.5mm lens and it must have a 62mm filter. He wants to use it for landscapes and 75mm is no good because he would have to move back a few feet and that might cause him to fall off a cliff. The 40-150mm f/2.8 is too heavy but he carries a tripod around (and takes 30 minutes to set it up).
Have we all been taken in?
Or it's just because I've shot a lot more photos a year, so I actually know what I want to photograph?
From marketing's PoV, how successful do you think it'll be if Olympus reissue yet another lens that already exists on the market? And if you haven't read others' post, you should really know 135mm equivalent is a very important focal length that m4/3 has yet to produce. (and 135mm is actually a 85mm-ish portrait focal length for medium format).
I do love my 75mm f/1.8 and I've shot quite a bit photos with it, but it does have its limitation. It's not its sharpness or rendering, but its focal length. Haven't you ever had a moment which you thought, "I wish I brought that lens with me?"
Old Olympus OM System (film) had the proper wisdom of sharing two filter sizes for almost all focal lengths below 135mm: 49mm for consumer level lenses, and 55mm for pro level lenses. It's not strange. It's what professionals want.
List of OM Lenses
Photography habits have changed quite a bit (EVF vs OVF, mirrorless vs mirror, shallow DoF vs more DoF, high contrast vs low contrast), so just because you don't shoot it that way doesn't mean other people are weird.
40-150mm like I mentioned, it's for wildlife (and zoom lenses are perfect for scout photos, and to test which focal length works best, but not for
the final version of the photo). When it comes to landscape, demand is very different. Edge-to-edge sharpness is more important for landscape so zoom lenses can be cumbersome while tripod is worth carrying because it improves that marginal sharpness perhaps you don't really care in your shooting style. You don't bring a portrait lens on a landscape expedition. Like wise, you don't carry a tripod if you were doing street photography that day. Would you carry a red filter if you were shooting color photos that day? Is polarizing filter necessary if you are going to shoot portraits? Carry the wrong gears is heavy. Shooting the wrong photo is costly, especially you've spent the last ten years perfecting your craft. You don't need another photo go straight down to recycle bin because it's not better than the last version.