That's definitely the ideal, but I think it's a bit of a vicious circle, really: online places are able to sell cheaper, so a lot of people buy from them, so more bricks and mortar go out of business, so more and more of us have to go online as that's the only option.... With better stuff, it worries me less as the instrument is much more likely to have had some proper attention, as distinct from buying budget bottom line where a lot of places will sent it out without unboxing, or even have it drop-shipped. I think the fact that the private second-hand market has been so taken over by online sales has also helped to normalise it. Course, I am perhaps less freaked out by this (even if I agree it's not ideal) because being left handed I've so often hand to commit to buying something without having seen it. Before I bought my US Std Strat in 1994 - and after two years of saving for it - I found one with a maple board (I wanted rosewood) in a store in Belfast. That was the sole example I'd had the chance to play before I ordered mine, and was financially committed such that once it arrived, unless there was an obvious fault, that was it.
Also worth noting that the Distance Selling Regulations (unless or until they are thrown on the post-Brexit bonfire) mean that if you order something from a store online and don't like it, you are legally entitled to return it without having to give any reason as long as you do it within seven working days. Yes, if there's no fault and it is what you ordered you have to pay for that return postage, BUT for a lot of folks that might be worth the gamble over the old situation where you love something in the shop but get it home and try it with your own gear, and it's a dud...