Last Thursday I had 12:02:56 of pedaling alone time with me, myself and I and tunes from the iPod on my 2018 Roubaix Expert. It's very nice not worrying about wheel overlap or riding too fast/slow being dictated by others. Unlike many here, I still enjoy group rides where being physically challenged does increase the ride experience. Having to go beyond one's self imposed limits still holds some fascination for this 68yo rider. I do enjoy riding a 100 miler in under 5 hours employing drafting since solo riding requires sooo much more time on the saddle. Most likely had I been on my Propel the 201.18 miles would have gone by in far less of a time frame last Thursday, but there is something physically beneficial about riding a heavier bike and keeping one's heart rate down when temps feel like triple digits due to high humidity.
It's easily a "ride what you like and how you like" for maximum enjoyment. We've earned it.