I don’t think it’s that level of unlikely.
Especially for blessings on class items because that drops the instances of it appearing by at least a third (Melk’s, gifts), the pool of class items to shared items is less than one quarter on average, then on top of that an average of 7 blessings and then tiers (it’s still possible to get T2 on oranges, whether by Melk’s, consecrate or gifts).
Sure, you can buy bases in Brunt’s but you’re still limited to about 4 weapons an hour + 2 from gifts (ignoring gifts because getting the right weapon is pretty low). A thousand hours of playing is 4000 weapons, of which you have to upgrade them to orange to try to roll a T4. You get enough mats to fully consecrate a grey every 2 or so games, meaning you only upgrade about 2000-3000 items in that time.
Of course this is if you’re targeting a single blessing on a single weapon
Without any firm data on the blessing appearance rates (it’s mostly assumed the blessings are even, it’s the tiers that have different rarities and the rare ones are only rare because they only appear at T4, which means the pool of T4 blessings increases) the probabilities are mostly conjecture, but even looking at the hard numbers of item acquisition it’s a slog to go through… for a single T4 Blessing on a specific weapon.
Because it’s RNG with no mitigation it’s still possible for it to swing from someone getting that blessing immediately to someone not getting it for even a thousand hours… especially if Fatshark has tuned the itemisation for at least 1000 hours based on some conjecture from some surveys they ran and their reaction at people playing VT2 for 1000s of hours.
TL;DR: farming a specific T4 Blessing is also filled with layers and layers of RNG, you never make any meaningful progression towards farming since it’s all RNG. The chance is even lower with human sized class specific weapons.
The reason I rail so hard on these kind of systems is that I’ve lived through some really bad unlucky streaks in games. Final Fantasy 14; had to hunt down 12 items each with a 3% drop rate from dynamic quests, farming those items don’t get you anything else, no xp (you’re already at max level at the time), no other drops (special dynamic quest mobs), on a good day you can do about 10 of them an hour and still took me over 300 hours of straight playing (over 3 months or so) when the average time according to the devs should have been about 20 hours. That’s what happens when you have unmitigated RNG. They’re unsatisfying and give you the sense you wasted your time when the numbers don’t roll up the right way.