Their shops always seem rather grubby and tatty, so not something I’d think of as a welcoming place to visit.
Also, not being on the high street or (usually) within range of a super market (trading estates in my experience are not always close to one of the larger supermarkets) would mean an extra journey to visit one. Really, a good toy shop will be on the high street where footfall is large, and the chance of passing trade increases. That would factor in “pester power” from children to buy stuff. We have a branch of the Entertainer, which is always rammed, with ringing tills all the time (apart from Sundays when it’s closed).
I think the future for retail will be a hybrid of high street and online. A range in store to buy and take home, but a greater range available for order and delivery. Toy R Us have clearly failed to do this. Walk-in high street stores that offered this kind of experience could have saved them.