Changing the CPI basket
You can argue at the margins about what the mix should be, but you can't argue about whether the mix or contents needs to be changed as times change.
A century ago the average person spent quite a bit more of their earnings on food than they do today. Food is a pretty small cost at the level of sustenance. The thing is, most people prefer to buy food at well above sustenance levels, buying "natural" or fancy foods, craft beer, expensive wines, going out to eat (paying someone else to make your food and do the dishes for you, basically) So it is probably a much larger portion of your income than it really has to be. Likewise fuel expenses depend to a large extent on how far you choose to live from where you work. They're also subject to fluctuations in price unrelated to the condition of the economy due to trouble in the middle east, drought, etc. So pulling those out of calculations of 'base' inflation makes a lot of sense.
Then you have technological advancement. 100 years ago no one had expenses for internet, cell phones, TVs, and so forth. Only the rich city dweller had to worry about bills for electricity or telephone. When the average person adds something to the basket of goods they buy, like cellular service/phones and internet over the past 15 years or so, it reduces the percentage spent on many other things. Hopefully because they're making more money, maybe because their saving less/going into debt, but regardless of that on a percentage basis of how much they spend on everything they're spending less on something else like landline telephones, buying CDs, going to movies, replacing their car less often because they shop online instead of driving to the mall twice a week or whatever.
Is it right to add stuff for buying computers and TVs? Well, consumer data shows people are buying an average 0.whatever computers and 0.whatever TVs each year, so obviously it isn't a crazy idea to represent it. The price of those do drop, so you get a much better computer or much better TV today than you did for the same money in 1995. That is exactly what the CPI is supposed to reflect. If you don't think that measures things accurately, come up with your own way of measuring inflation and get people to accept it as superior. Claiming that they're gaming the system by adding stuff that falls in price serves no one except conspiracy theorists. They're only gaming the system if they add things that fall in price that typical consumers are not actually buying.