Some domains are evergreen, so regardless of trends, they’ll hold their value and provide liquidity (meaning they can be sold at any given time, regardless of market conditions or trends). Premium one-word domains, short and rare domains, are always in style and sought after by end users/businesses and fellow domain investors.
If you’re dealing in trendy names, such as something that’s intentionally misspelled, or some new extension, you should be aware that this type of name typically has a short lifespan. AKA trends come and go. There’s always some hot new thing but people always return to the classics. For long term investment, for liquidity, you’ll definitely want some premium names in your portfolio. It’s kind of like a gambler hedging their bets..
But sure, it can’t hurt to hop on trends so long as you understand you might have a short period of time in which to capitalize. Buy, flip, move on (re-invest in better names). Don’t be left holding the bag..
That’s my 2 cents on buying domains based on trends. In a nutshell, just be aware of when to get in, and when to get out..