I regret you can't see much of the car numbers on todays F1 cars. In the past it was so easy to see the number so I knew immediately whose car was shown. Today I cannot always tell who is who just by the helmet. Helmet designs of the drivers change also much more than in the past. In the past they drove with the same design like their whole career.
Yes, totally agreed. It's weird, too, because there is a lot of merchandising in F1 these days and an awful lot of it prominently focuses on car number - displayed in big fonts on T-shirts or the side of baseball caps, etc. It's much easier to tell a driver's number by looking at their clothes than at their car! You'd have thought if they wanted to 'sell' the number, then they might want to make it a bit clearer on the car.
What's wrong with a nice big number on the rear wing and on the front of the car? McLaren are at least still legible - pretty well using the same font and size as ever.