Stock ROMs have gotten better, modding had gotten less convenient. Safetynet is a huge problem there, especially for fully custom ROMs (there's workarounds which allow you to root an OEM ROM and still pass safetynet most of the time but for a custom ROM you're SOL and they often aren't even trying due to fearing google's wrath). Safetynet especially is really bad: it's not good enough to actually give a meaningful level of protection against malware or modifications, but it is good enough to basically make it not worth the while of running a custom ROM.