It's illegal here too.
You are concerned about a different thing, speed/ease. It's a legitimate thing, but has nothing to do with what I, and not to speak for Obi-Wan but I think him too, have concerns about.
The issue is what happens when/if the seeds get intercepted? Because while a person may not have had any problems that neither means it won't or that it doesn't. With Customs you have a huge agency looking for contraband, when they find something like small seed orders, they have neither money nor the manpower to go chase down some home grow, which they then have to prove actually ordered the seeds, except they intercepted them so you never actually possessed them so there is no crime, and to prove otherwise they have to get information from a foreign business who has no desire to cooperate.
When you're dealing with a US seedbank you're dealing with the US Post Office a Federal Agency who's entire purpose is domestic, and who for the record is not part of the DOJ and therefore not restricted by the budget amendment that protects medical users in legal States. They have absolute free reign to investigate, and prosecute everywhere if it involves the mail.
There are articles left and right about Sessions wanting to kick the drug war off again, prohibition States pulling over cars entering from legal States to check for weed etc., articles about weed being sent through the mail and all the info is domestic and subject to subpoena from companies who would also be under investigation and who's best interest is served by complying.
The interesting thing is the package that has no issues is actually the most dangerous no matter domestic or foreign, because if they want to get someone, they're going to do it as the person get the seeds, they need them to be in possession.
Fortunately we're mostly all very small fish and under most radars and very unlikely to have issues these days from either order platform, unlike back in the good old days, lol.
I live in a town of less than 100 people, all I need is some hick post master general from Corn Hollow looking to keep his job snooping around my stuff, lol. I order way ahead of when I'll want the seeds, both to account for the shipping and to get around out -of -stock. Which is another thing most US banks have either a terrible selection or they're always out of stock.
But that's not to convince anyone, just my reasoning why I do it the way I do

I have SOS on my links, I look at what they have a lot, and once we get prohibition ended I'll make the switch, providing what I want is avail, lol