Absolutely. 4 movements in a workout is plenty, IMO. Depending on your rep/set scheme, you may be over doing it if you're coming back from a long layoff.

Start tapering in some accessory work as you acclimate to your routine.

If you're feeling completely wiped workout after workout, take a closer look at your volume and intensity. Too much of that can be a problem. Head over to Barbell Medicine and see what they have to say about session RPE (sRPE).

It's a fine routine until you notice it isn't. I did the Stronglifts 5x5 for a long time until I started noticing weakness is certain muscles. Then I started targeting and expanding.

Personally I've worked out for years doing primarily the big 4, and have gotten good results. Occasionally id do assistance work but not usually. The only thing that's noticeable are my arms and back are a little lacking in definition imo, but not severely. Id say you should be fine, especially if you plan to pick it up more accessory work later on.

I also lift on the heavier side of my %ORM for strength though.

The big question is what would you want to get out of doing more accessory exercises? If you're hitting all the muscles you want to hit, and it looks like you're doing the classic routine that hits the big areas evenly, I dont see any issues with 2 per week, you'll still get stronger and grow muscle, depending on how weights and reps. Further, more workouts equals more fatigue which equals higher risk of injuring yourself, so if you just want to do accessories for the sake of doing them, that's just burning energy to wear yourself out, and you could probably do a better job of that through cardio. I do a couple of accessory days myself, but that's more shoulder and wrist work to help my tennis, as well as a functional leg training day in amongst there since I work outdoors a lot. It all comes down to what you want out of it and what your body will allow.