Tradeoffs of external phono stages?

This is a bit of a YMMV question, but here it is:

I have had an Audible Illusions Modulus 3 with internal MM phono stage since the mid aughts, and I’ve been quite happy with it. Looking down the road, I’m thinking I’ll need to replace it one way or another. It’s pushing 30 years old and I’ve heard that it’s hard to get these units serviced (in a reasonable amount of time, at any rate). That said, it’s been a fantastic value. I didn’t pay much for it used, and it’s been completely reliable. I’ve just replaced the tubes every few years. I haven’t auditioned different preamps separately, but my system sounds really good. I’m using this preamp with good equipment - a Sota Sapphire with a dynavector cartridge, a DIY First Watt M2 clone for amplification, Naim NDS streamer, and a changing cast of vintage British speakers: Tannoy Monitor Golds and Quad ESL 57s. With acoustic music, the analog source outperforms the streamer.

Anyways, the question I’m reaching for is whether buying line and phono stages separately is cost effective… as a rule. With separates, you’re buying two chassis, another set of interconnects and so on. Maybe having a separate power supply for the phono stage is a built in advantage? With something like an AI Modulus delivering so much bang for the buck, I just don’t see it. If my trusty Modulus were to go out of commission now, I’d probably be looking at a used Rogue Audio preamp with a built in MM phono stage - maybe a 99 magnum. If you’re serious about vinyl, does this approach make sense?