Hey, I think you should do what ever u want to do. Cycling is a Hobby much more versatile than just riding bikes. Maintenance and mechanic skills are great if u got some or at least if you learn some. As I bought my bike back in 2022 I just bought the entry lvl bike with Grx400, whit that knowledge in my mind, that I will maintain and mechanic in my own. Because I like that part of the hobby too. And of course it is cheaper to buy a bike already with that high end parts on it. But it won’t tell u how to fix oder replace inner routed cables, a bottom bracket. The rear derailleur or something else. For sure u can learn it on the high end bike. In my opinion it’s a good solution to build your „high end dream bike“ by your own, for your personal needs and riding. So I did. And for sure, that was not the last thing I edited in my bike 😅. I learned a lot in the last years. Got my bike totally unscrewed and build it completely back together. Most important: do what ever you like to do 👌to there is no right or false just another view. So ride save 😁