There’s some truth in the manufacturer blurb, but in tennis it’s a lot worse than cycling so I’d just stick with what you’ve already got if you’re comfortable with it and invest the money in lessons with a decent coach, and practice. In addition to the coaching you could consider paying someone to “hit” with you. I don’t mean going out and playing sets, but rallies focussed on a particular shot, or shot combo. For example, work on your down the line forehand/backhand, or my favourite session, my cross-court forehand/backhand to the other player’s down the line forehand/backhand. These are the sessions that will make you improve. This will buy you the best return in terms of real improvement because you will work on your strokeplay and your movement.
If you’ve not got time for this then I suggest you up your tennis specific fitness. Short sprints, side to side movements, back pedalling, skipping, flexibility training. Cheap, doable even in a small garden and they are time efficient.
Almost none of the pros play with what’s actually on the market. Their rackets are usually the ones they’ve played with since they were about 16 painted to look like what they’re currently flogging.
If you just want to buy a shiny new racket, then pick your favourite pro, go to a shop and buy the racket you think he/she is playing with, or ask for a club version of it. The latter will be lighter, and probably a larger head size to compensate for club players’ lack of technique and strength.
If you still want to just indulge in some retail therapy, the money is better invested in a good pair of shoes. This is one place where the manufacturer is not conning you. The shoes of today versus what I could buy 20 years ago are light years ahead. Lighter, more breathable and perhaps more durable too. Rackets haven’t changed much or at all.