So as a management consultant I've had, in the 15 years since my kids first started arriving, 5 years of commuting to Edinburgh on a weekly basis, 2 years of commuting to Manchester on a weekly basis, 6 months of commuting to Swindon on a weekly basis, 6 months of commuting to China on a monthly basis and a year of commuting to India on a 6-8 weekly basis.
Sometimes it wasn't ideal, but we have coped pretty well, mostly by not taking work home for the weekend. As we enter the 4th month of lockdown, it's probably harder all being stuck at home than at any point except when I was in India. The point being, it's a very individual thing. Some families find it hard to be apart, some families work well with a bit of distance, and even that can change by circumstances.
All of which said, I could understand him wanting to go back to Wales... but for someone like him at the start of his coaching career it may come down more to which club is going to offer him the best opportunity to develop his skills and coaching brand.