Some valid points there. I wear a piece myself, but I freely acknowledge they are not for everyone.
If you leave it till you are slick bald before you start to wear, then of course people will know. Some rug sites would have you believe that people will just not notice it - 'I can't put my finger on what Noah has done, but he looks years younger!' - needless to say that is BS. If you want to go under the radar you have to start before you are noticeably bald. However, the sort of people who are sufficiently concerned about being bald that they are considering a hairpiece are fretting about it well before that stage. The typical path is via heavier and heavier use of concealers until they are so messy and unnatural that a hairpiece is a better option.
As others have said, modern men's hairpieces are capable of giving a very natural and undetectable look, and they won't come off. However, I don't think any hairpiece wearer is very enthusiastic about people feeling around in their hair or pulling it. It is a lot of extra work to maintain a piece which is undetectable to sustained physical contact. A 10 minute encounter in the heat of passion is one thing, but for a regular sex partner you really have to man up and tell them, because there is a good chance they will discover sooner or later. For anyone who thinks it would just destroy them to have to fess up like that, hairpieces are not the solution for you. I will say this: the anticipation is worse than the reality. The frisson we feel is to do with our own sensitivities about being manly and not appearing vain, but others don't have the same feelings. I have had "the talk" a few times now, and the outcome has always been positive and less of a drama than we imagine in our head. Women in particular are pretty matter-of-fact about cosmetic fakery. Fessing up to wearing a piece feels no different to admitting you have a few false teeth, or you have had some hair plugs, or you use scalp make-up, or you dye your hair, or you go every month for a Botox session on your face. It's a downer, but in the grand scheme of things it's no big deal.