I personally find shooting boar over feed, from a highseat and with thermal/ night vision combo distasteful, although I will add lots of people seem to think it acceptable. At least this one was in day light.
If you had to rely on stalking boar, to hunt/kill them in the UK, you'd really struggle, to say the least.
They are not widespread like deer, are far more nocturnal, but the biggest difficulty is that the areas they are found, are highly controlled, often by the Forestry Commission, and the rest tends to be split into small private holdings. Land in the Forest of Dean, is highly sort after, and woodland gets split, and sold off at £10000.00-£15000.00 per acre, so the areas tend to be small, impractical to stalk, especially as it's common to have someone "glamping" on the next plot.
Then you have the people who own, or lease the land for shooting, charging circa £150.00 to just sit in the seat, so they need to make sure there's a fair chance the person shooting stands some chance of seeing something to shoot. And to put it into perspective, boar are not stupid, and can be really difficult to shoot, especially in areas that are shot regularly, and from my own experience, you need to be prepared to put in a lot of hours, to be successful. I suspect that the success rate is something like 5-7:1.
Consequently, feed stations, high seats/towers, and shooting at night are the the only practical way to shoot boar in the UK.